[Buildroot] [PATCH 1/1] package/putty: fix CVE-2021-36367

Yann E. MORIN yann.morin.1998 at free.fr
Sat Jul 17 10:02:43 UTC 2021


Fabrice, All,

On 2021-07-17 11:16 +0200, Fabrice Fontaine spake thusly:
> PuTTY through 0.75 proceeds with establishing an SSH session even if it
> has never sent a substantive authentication response. This makes it
> easier for an attacker-controlled SSH server to present a later spoofed
> authentication prompt (that the attacker can use to capture credential
> data, and use that data for purposes that are undesired by the client
> user).
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>

Applied to master, thanks.

Regards,
Yann E. MORIN.

> ---
>  ...o-reject-trivial-success-of-userauth.patch | 448 ++++++++++++++++++
>  package/putty/putty.mk                        |   3 +
>  2 files changed, 451 insertions(+)
>  create mode 100644 package/putty/0002-New-option-to-reject-trivial-success-of-userauth.patch
> 
> diff --git a/package/putty/0002-New-option-to-reject-trivial-success-of-userauth.patch b/package/putty/0002-New-option-to-reject-trivial-success-of-userauth.patch
> new file mode 100644
> index 0000000000..83b93a346c
> --- /dev/null
> +++ b/package/putty/0002-New-option-to-reject-trivial-success-of-userauth.patch
> @@ -0,0 +1,448 @@
> +From 1dc5659aa62848f0aeb5de7bd3839fecc7debefa Mon Sep 17 00:00:00 2001
> +From: Simon Tatham <anakin at pobox.com>
> +Date: Sat, 19 Jun 2021 15:39:15 +0100
> +Subject: [PATCH] New option to reject 'trivial' success of userauth.
> +
> +Suggested by Manfred Kaiser, who also wrote most of this patch
> +(although outlying parts, like documentation and SSH-1 support, are by
> +me).
> +
> +This is a second line of defence against the kind of spoofing attacks
> +in which a malicious or compromised SSH server rushes the client
> +through the userauth phase of SSH without actually requiring any auth
> +inputs (passwords or signatures or whatever), and then at the start of
> +the connection phase it presents something like a spoof prompt,
> +intended to be taken for part of userauth by the user but in fact with
> +some more sinister purpose.
> +
> +Our existing line of defence against this is the trust sigil system,
> +and as far as I know, that's still working. This option allows a bit of
> +extra defence in depth: if you don't expect your SSH server to
> +trivially accept authentication in the first place, then enabling this
> +option will cause PuTTY to disconnect if it unexpectedly does so,
> +without the user having to spot the presence or absence of a fiddly
> +little sigil anywhere.
> +
> +Several types of authentication count as 'trivial'. The obvious one is
> +the SSH-2 "none" method, which clients always try first so that the
> +failure message will tell them what else they can try, and which a
> +server can instead accept in order to authenticate you unconditionally.
> +But there are two other ways to do it that we know of: one is to run
> +keyboard-interactive authentication and send an empty INFO_REQUEST
> +packet containing no actual prompts for the user, and another even
> +weirder one is to send USERAUTH_SUCCESS in response to the user's
> +preliminary *offer* of a public key (instead of sending the usual PK_OK
> +to request an actual signature from the key).
> +
> +This new option detects all of those, by clearing the 'is_trivial_auth'
> +flag only when we send some kind of substantive authentication response
> +(be it a password, a k-i prompt response, a signature, or a GSSAPI
> +token). So even if there's a further path through the userauth maze we
> +haven't spotted, that somehow avoids sending anything substantive, this
> +strategy should still pick it up.
> +
> +(cherry picked from commit 5f5c710cf3704737e24ffceb2c918e412a2a674f)
> +
> +[Retrieved from:
> +https://git.tartarus.org/?p=simon/putty.git;a=commit;h=1dc5659aa62848f0aeb5de7bd3839fecc7debefa]
> +Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
> +---
> + cmdline.c          |  8 ++++++++
> + config.c           |  4 ++++
> + doc/config.but     | 43 +++++++++++++++++++++++++++++++++++++++++++
> + pscp.c             |  2 ++
> + psftp.c            |  2 ++
> + putty.h            |  1 +
> + settings.c         |  2 ++
> + ssh.c              |  4 +++-
> + ssh1login.c        | 14 +++++++++++++-
> + ssh2userauth.c     | 20 ++++++++++++++++----
> + sshppl.h           |  2 +-
> + unix/uxplink.c     |  2 ++
> + windows/winhelp.h  |  1 +
> + windows/winplink.c |  2 ++
> + 14 files changed, 100 insertions(+), 7 deletions(-)
> +
> +diff --git a/cmdline.c b/cmdline.c
> +index 7ea5cacc..62d65e19 100644
> +--- a/cmdline.c
> ++++ b/cmdline.c
> +@@ -598,6 +598,14 @@ int cmdline_process_param(const char *p, char *value,
> +         SAVEABLE(0);
> +         conf_set_bool(conf, CONF_tryagent, false);
> +     }
> ++
> ++    if (!strcmp(p, "-no-trivial-auth")) {
> ++        RETURN(1);
> ++        UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
> ++        SAVEABLE(0);
> ++        conf_set_bool(conf, CONF_ssh_no_trivial_userauth, true);
> ++    }
> ++
> +     if (!strcmp(p, "-share")) {
> +         RETURN(1);
> +         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
> +diff --git a/config.c b/config.c
> +index ca808511..b8348530 100644
> +--- a/config.c
> ++++ b/config.c
> +@@ -2772,6 +2772,10 @@ void setup_config_box(struct controlbox *b, bool midsession,
> +                           HELPCTX(ssh_auth_bypass),
> +                           conf_checkbox_handler,
> +                           I(CONF_ssh_no_userauth));
> ++            ctrl_checkbox(s, "Disconnect if authentication succeeds trivially",
> ++                          'n', HELPCTX(ssh_no_trivial_userauth),
> ++                          conf_checkbox_handler,
> ++                          I(CONF_ssh_no_trivial_userauth));
> + 
> +             s = ctrl_getset(b, "Connection/SSH/Auth", "methods",
> +                             "Authentication methods");
> +diff --git a/doc/config.but b/doc/config.but
> +index a00ae476..77313282 100644
> +--- a/doc/config.but
> ++++ b/doc/config.but
> +@@ -2623,6 +2623,49 @@ interact with them.)
> + This option only affects SSH-2 connections. SSH-1 connections always
> + require an authentication step.
> + 
> ++\S{config-ssh-notrivialauth} \q{Disconnect if authentication succeeds
> ++trivially}
> ++
> ++This option causes PuTTY to abandon an SSH session and disconnect from
> ++the server, if the server accepted authentication without ever having
> ++asked for any kind of password or signature or token.
> ++
> ++This might be used as a security measure. There are some forms of
> ++attack against an SSH client user which work by terminating the SSH
> ++authentication stage early, and then doing something in the main part
> ++of the SSH session which \e{looks} like part of the authentication,
> ++but isn't really.
> ++
> ++For example, instead of demanding a signature from your public key,
> ++for which PuTTY would ask for your key's passphrase, a compromised or
> ++malicious server might allow you to log in with no signature or
> ++password at all, and then print a message that \e{imitates} PuTTY's
> ++request for your passphrase, in the hope that you would type it in.
> ++(In fact, the passphrase for your public key should not be sent to any
> ++server.)
> ++
> ++PuTTY's main defence against attacks of this type is the \q{trust
> ++sigil} system: messages in the PuTTY window that are truly originated
> ++by PuTTY itself are shown next to a small copy of the PuTTY icon,
> ++which the server cannot fake when it tries to imitate the same message
> ++using terminal output.
> ++
> ++However, if you think you might be at risk of this kind of thing
> ++anyway (if you don't watch closely for the trust sigils, or if you
> ++think you're at extra risk of one of your servers being malicious),
> ++then you could enable this option as an extra defence. Then, if the
> ++server tries any of these attacks involving letting you through the
> ++authentication stage, PuTTY will disconnect from the server before it
> ++can send a follow-up fake prompt or other type of attack.
> ++
> ++On the other hand, some servers \e{legitimately} let you through the
> ++SSH authentication phase trivially, either because they are genuinely
> ++public, or because the important authentication step happens during
> ++the terminal session. (An example might be an SSH server that connects
> ++you directly to the terminal login prompt of a legacy mainframe.) So
> ++enabling this option might cause some kinds of session to stop
> ++working. It's up to you.
> ++
> + \S{config-ssh-tryagent} \q{Attempt authentication using Pageant}
> + 
> + If this option is enabled, then PuTTY will look for Pageant (the SSH
> +diff --git a/pscp.c b/pscp.c
> +index 0bfda92d..a11d1e18 100644
> +--- a/pscp.c
> ++++ b/pscp.c
> +@@ -2203,6 +2203,8 @@ static void usage(void)
> +     printf("  -i key    private key file for user authentication\n");
> +     printf("  -noagent  disable use of Pageant\n");
> +     printf("  -agent    enable use of Pageant\n");
> ++    printf("  -no-trivial-auth\n");
> ++    printf("            disconnect if SSH authentication succeeds trivially\n");
> +     printf("  -hostkey keyid\n");
> +     printf("            manually specify a host key (may be repeated)\n");
> +     printf("  -batch    disable all interactive prompts\n");
> +diff --git a/psftp.c b/psftp.c
> +index 40cb73f5..c4b5374b 100644
> +--- a/psftp.c
> ++++ b/psftp.c
> +@@ -2538,6 +2538,8 @@ static void usage(void)
> +     printf("  -i key    private key file for user authentication\n");
> +     printf("  -noagent  disable use of Pageant\n");
> +     printf("  -agent    enable use of Pageant\n");
> ++    printf("  -no-trivial-auth\n");
> ++    printf("            disconnect if SSH authentication succeeds trivially\n");
> +     printf("  -hostkey keyid\n");
> +     printf("            manually specify a host key (may be repeated)\n");
> +     printf("  -batch    disable all interactive prompts\n");
> +diff --git a/putty.h b/putty.h
> +index ef6f7a37..7789f217 100644
> +--- a/putty.h
> ++++ b/putty.h
> +@@ -1428,6 +1428,7 @@ NORETURN void cleanup_exit(int);
> +     X(INT, NONE, sshprot) \
> +     X(BOOL, NONE, ssh2_des_cbc) /* "des-cbc" unrecommended SSH-2 cipher */ \
> +     X(BOOL, NONE, ssh_no_userauth) /* bypass "ssh-userauth" (SSH-2 only) */ \
> ++    X(BOOL, NONE, ssh_no_trivial_userauth) /* disable trivial types of auth */ \
> +     X(BOOL, NONE, ssh_show_banner) /* show USERAUTH_BANNERs (SSH-2 only) */ \
> +     X(BOOL, NONE, try_tis_auth) \
> +     X(BOOL, NONE, try_ki_auth) \
> +diff --git a/settings.c b/settings.c
> +index 547af0dc..32a53c54 100644
> +--- a/settings.c
> ++++ b/settings.c
> +@@ -609,6 +609,7 @@ void save_open_settings(settings_w *sesskey, Conf *conf)
> + #endif
> +     write_setting_s(sesskey, "RekeyBytes", conf_get_str(conf, CONF_ssh_rekey_data));
> +     write_setting_b(sesskey, "SshNoAuth", conf_get_bool(conf, CONF_ssh_no_userauth));
> ++    write_setting_b(sesskey, "SshNoTrivialAuth", conf_get_bool(conf, CONF_ssh_no_trivial_userauth));
> +     write_setting_b(sesskey, "SshBanner", conf_get_bool(conf, CONF_ssh_show_banner));
> +     write_setting_b(sesskey, "AuthTIS", conf_get_bool(conf, CONF_try_tis_auth));
> +     write_setting_b(sesskey, "AuthKI", conf_get_bool(conf, CONF_try_ki_auth));
> +@@ -1025,6 +1026,7 @@ void load_open_settings(settings_r *sesskey, Conf *conf)
> +     gpps(sesskey, "LogHost", "", conf, CONF_loghost);
> +     gppb(sesskey, "SSH2DES", false, conf, CONF_ssh2_des_cbc);
> +     gppb(sesskey, "SshNoAuth", false, conf, CONF_ssh_no_userauth);
> ++    gppb(sesskey, "SshNoTrivialAuth", false, conf, CONF_ssh_no_trivial_userauth);
> +     gppb(sesskey, "SshBanner", true, conf, CONF_ssh_show_banner);
> +     gppb(sesskey, "AuthTIS", false, conf, CONF_try_tis_auth);
> +     gppb(sesskey, "AuthKI", true, conf, CONF_try_ki_auth);
> +diff --git a/ssh.c b/ssh.c
> +index 00a516ea..91e7e869 100644
> +--- a/ssh.c
> ++++ b/ssh.c
> +@@ -254,7 +254,9 @@ static void ssh_got_ssh_version(struct ssh_version_receiver *rcv,
> +                     connection_layer, ssh->savedhost, ssh->fullhostname,
> +                     conf_get_filename(ssh->conf, CONF_keyfile),
> +                     conf_get_bool(ssh->conf, CONF_ssh_show_banner),
> +-                    conf_get_bool(ssh->conf, CONF_tryagent), username,
> ++                    conf_get_bool(ssh->conf, CONF_tryagent),
> ++                    conf_get_bool(ssh->conf, CONF_ssh_no_trivial_userauth),
> ++                    username,
> +                     conf_get_bool(ssh->conf, CONF_change_username),
> +                     conf_get_bool(ssh->conf, CONF_try_ki_auth),
> + #ifndef NO_GSSAPI
> +diff --git a/ssh1login.c b/ssh1login.c
> +index 8486cbf0..519838d7 100644
> +--- a/ssh1login.c
> ++++ b/ssh1login.c
> +@@ -27,7 +27,7 @@ struct ssh1_login_state {
> + 
> +     char *savedhost;
> +     int savedport;
> +-    bool try_agent_auth;
> ++    bool try_agent_auth, is_trivial_auth;
> + 
> +     int remote_protoflags;
> +     int local_protoflags;
> +@@ -105,6 +105,8 @@ PacketProtocolLayer *ssh1_login_new(
> +     s->savedhost = dupstr(host);
> +     s->savedport = port;
> +     s->successor_layer = successor_layer;
> ++    s->is_trivial_auth = true;
> ++
> +     return &s->ppl;
> + }
> + 
> +@@ -645,6 +647,7 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
> +                                 s->ppl.bpp, SSH1_CMSG_AUTH_RSA_RESPONSE);
> +                             put_data(pkt, ret + 5, 16);
> +                             pq_push(s->ppl.out_pq, pkt);
> ++                            s->is_trivial_auth = false;
> +                             crMaybeWaitUntilV(
> +                                 (pktin = ssh1_login_pop(s))
> +                                 != NULL);
> +@@ -814,6 +817,7 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
> +                         s->ppl.bpp, SSH1_CMSG_AUTH_RSA_RESPONSE);
> +                     put_data(pkt, buffer, 16);
> +                     pq_push(s->ppl.out_pq, pkt);
> ++                    s->is_trivial_auth = false;
> + 
> +                     mp_free(challenge);
> +                     mp_free(response);
> +@@ -1105,6 +1109,7 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
> +             put_stringz(pkt, prompt_get_result_ref(s->cur_prompt->prompts[0]));
> +             pq_push(s->ppl.out_pq, pkt);
> +         }
> ++        s->is_trivial_auth = false;
> +         ppl_logevent("Sent password");
> +         free_prompts(s->cur_prompt);
> +         s->cur_prompt = NULL;
> +@@ -1121,6 +1126,13 @@ static void ssh1_login_process_queue(PacketProtocolLayer *ppl)
> +         }
> +     }
> + 
> ++    if (conf_get_bool(s->conf, CONF_ssh_no_trivial_userauth) &&
> ++        s->is_trivial_auth) {
> ++        ssh_proto_error(s->ppl.ssh, "Authentication was trivial! "
> ++                        "Abandoning session as specified in configuration.");
> ++        return;
> ++    }
> ++
> +     ppl_logevent("Authentication successful");
> + 
> +     if (conf_get_bool(s->conf, CONF_compression)) {
> +diff --git a/ssh2userauth.c b/ssh2userauth.c
> +index 01243baf..451d5abe 100644
> +--- a/ssh2userauth.c
> ++++ b/ssh2userauth.c
> +@@ -28,7 +28,7 @@ struct ssh2_userauth_state {
> + 
> +     PacketProtocolLayer *transport_layer, *successor_layer;
> +     Filename *keyfile;
> +-    bool show_banner, tryagent, change_username;
> ++    bool show_banner, tryagent, notrivialauth, change_username;
> +     char *hostname, *fullhostname;
> +     char *default_username;
> +     bool try_ki_auth, try_gssapi_auth, try_gssapi_kex_auth, gssapi_fwd;
> +@@ -82,6 +82,7 @@ struct ssh2_userauth_state {
> +     int len;
> +     PktOut *pktout;
> +     bool want_user_input;
> ++    bool is_trivial_auth;
> + 
> +     agent_pending_query *auth_agent_query;
> +     bufchain banner;
> +@@ -134,7 +135,7 @@ static const PacketProtocolLayerVtable ssh2_userauth_vtable = {
> + PacketProtocolLayer *ssh2_userauth_new(
> +     PacketProtocolLayer *successor_layer,
> +     const char *hostname, const char *fullhostname,
> +-    Filename *keyfile, bool show_banner, bool tryagent,
> ++    Filename *keyfile, bool show_banner, bool tryagent, bool notrivialauth,
> +     const char *default_username, bool change_username,
> +     bool try_ki_auth, bool try_gssapi_auth, bool try_gssapi_kex_auth,
> +     bool gssapi_fwd, struct ssh_connection_shared_gss_state *shgss)
> +@@ -149,6 +150,7 @@ PacketProtocolLayer *ssh2_userauth_new(
> +     s->keyfile = filename_copy(keyfile);
> +     s->show_banner = show_banner;
> +     s->tryagent = tryagent;
> ++    s->notrivialauth = notrivialauth;
> +     s->default_username = dupstr(default_username);
> +     s->change_username = change_username;
> +     s->try_ki_auth = try_ki_auth;
> +@@ -157,6 +159,7 @@ PacketProtocolLayer *ssh2_userauth_new(
> +     s->gssapi_fwd = gssapi_fwd;
> +     s->shgss = shgss;
> +     s->last_methods_string = strbuf_new();
> ++    s->is_trivial_auth = true;
> +     bufchain_init(&s->banner);
> +     bufchain_sink_init(&s->banner_bs, &s->banner);
> + 
> +@@ -818,6 +821,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
> +                                 sigblob);
> +                             pq_push(s->ppl.out_pq, s->pktout);
> +                             s->type = AUTH_TYPE_PUBLICKEY;
> ++                            s->is_trivial_auth = false;
> +                         } else {
> +                             ppl_logevent("Pageant refused signing request");
> +                             ppl_printf("Pageant failed to "
> +@@ -1038,6 +1042,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
> +                     ssh_key_free(key->key);
> +                     sfree(key->comment);
> +                     sfree(key);
> ++                    s->is_trivial_auth = false;
> +                 }
> + 
> + #ifndef NO_GSSAPI
> +@@ -1169,6 +1174,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
> +                      * no longer says CONTINUE_NEEDED
> +                      */
> +                     if (s->gss_sndtok.length != 0) {
> ++                        s->is_trivial_auth = false;
> +                         s->pktout =
> +                             ssh_bpp_new_pktout(
> +                                 s->ppl.bpp, SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
> +@@ -1288,7 +1294,6 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
> +                  * Loop while the server continues to send INFO_REQUESTs.
> +                  */
> +                 while (pktin->type == SSH2_MSG_USERAUTH_INFO_REQUEST) {
> +-
> +                     ptrlen name, inst;
> +                     strbuf *sb;
> + 
> +@@ -1308,6 +1313,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
> +                      */
> +                     s->num_prompts = get_uint32(pktin);
> +                     for (uint32_t i = 0; i < s->num_prompts; i++) {
> ++                        s->is_trivial_auth = false;
> +                         ptrlen prompt = get_string(pktin);
> +                         bool echo = get_bool(pktin);
> + 
> +@@ -1472,7 +1478,7 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
> +                 pq_push_front(s->ppl.in_pq, pktin);
> + 
> +             } else if (s->can_passwd) {
> +-
> ++                s->is_trivial_auth = false;
> +                 /*
> +                  * Plain old password authentication.
> +                  */
> +@@ -1731,6 +1737,12 @@ static void ssh2_userauth_process_queue(PacketProtocolLayer *ppl)
> +     }
> + 
> +   userauth_success:
> ++    if (s->notrivialauth && s->is_trivial_auth) {
> ++        ssh_proto_error(s->ppl.ssh, "Authentication was trivial! "
> ++                        "Abandoning session as specified in configuration.");
> ++        return;
> ++    }
> ++
> +     /*
> +      * We've just received USERAUTH_SUCCESS, and we haven't sent
> +      * any packets since. Signal the transport layer to consider
> +diff --git a/sshppl.h b/sshppl.h
> +index b339d67c..2c1dbf42 100644
> +--- a/sshppl.h
> ++++ b/sshppl.h
> +@@ -116,7 +116,7 @@ PacketProtocolLayer *ssh2_transport_new(
> + PacketProtocolLayer *ssh2_userauth_new(
> +     PacketProtocolLayer *successor_layer,
> +     const char *hostname, const char *fullhostname,
> +-    Filename *keyfile, bool show_banner, bool tryagent,
> ++    Filename *keyfile, bool show_banner, bool tryagent, bool notrivialauth,
> +     const char *default_username, bool change_username,
> +     bool try_ki_auth,
> +     bool try_gssapi_auth, bool try_gssapi_kex_auth,
> +diff --git a/unix/uxplink.c b/unix/uxplink.c
> +index 3e2a9b6b..240783f4 100644
> +--- a/unix/uxplink.c
> ++++ b/unix/uxplink.c
> +@@ -527,6 +527,8 @@ static void usage(void)
> +     printf("  -i key    private key file for user authentication\n");
> +     printf("  -noagent  disable use of Pageant\n");
> +     printf("  -agent    enable use of Pageant\n");
> ++    printf("  -no-trivial-auth\n");
> ++    printf("            disconnect if SSH authentication succeeds trivially\n");
> +     printf("  -noshare  disable use of connection sharing\n");
> +     printf("  -share    enable use of connection sharing\n");
> +     printf("  -hostkey keyid\n");
> +diff --git a/windows/winhelp.h b/windows/winhelp.h
> +index ae5a7a7f..9011df45 100644
> +--- a/windows/winhelp.h
> ++++ b/windows/winhelp.h
> +@@ -111,6 +111,7 @@
> + #define WINHELP_CTX_ssh_kex_repeat "config-ssh-kex-rekey"
> + #define WINHELP_CTX_ssh_kex_manual_hostkeys "config-ssh-kex-manual-hostkeys"
> + #define WINHELP_CTX_ssh_auth_bypass "config-ssh-noauth"
> ++#define WINHELP_CTX_ssh_no_trivial_userauth "config-ssh-notrivialauth"
> + #define WINHELP_CTX_ssh_auth_banner "config-ssh-banner"
> + #define WINHELP_CTX_ssh_auth_privkey "config-ssh-privkey"
> + #define WINHELP_CTX_ssh_auth_agentfwd "config-ssh-agentfwd"
> +diff --git a/windows/winplink.c b/windows/winplink.c
> +index 9bda0712..58d43e6d 100644
> +--- a/windows/winplink.c
> ++++ b/windows/winplink.c
> +@@ -149,6 +149,8 @@ static void usage(void)
> +     printf("  -i key    private key file for user authentication\n");
> +     printf("  -noagent  disable use of Pageant\n");
> +     printf("  -agent    enable use of Pageant\n");
> ++    printf("  -no-trivial-auth\n");
> ++    printf("            disconnect if SSH authentication succeeds trivially\n");
> +     printf("  -noshare  disable use of connection sharing\n");
> +     printf("  -share    enable use of connection sharing\n");
> +     printf("  -hostkey keyid\n");
> +-- 
> +2.20.1
> +
> diff --git a/package/putty/putty.mk b/package/putty/putty.mk
> index 1e5a89ea9f..a1c588a382 100644
> --- a/package/putty/putty.mk
> +++ b/package/putty/putty.mk
> @@ -11,6 +11,9 @@ PUTTY_LICENSE_FILES = LICENCE
>  PUTTY_CPE_ID_VENDOR = putty
>  PUTTY_CONF_OPTS = --disable-gtktest
>  
> +# 0002-New-option-to-reject-trivial-success-of-userauth.patch
> +PUTTY_IGNORE_CVES += CVE-2021-36367
> +
>  ifeq ($(BR2_PACKAGE_LIBGTK2),y)
>  PUTTY_CONF_OPTS += --with-gtk=2
>  PUTTY_DEPENDENCIES += libgtk2
> -- 
> 2.30.2
> 
> _______________________________________________
> buildroot mailing list
> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot

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