From e9bbefbf0f24c57645e7ad6a5a71ae649d18ac8e Mon Sep 17 00:00:00 2001
From: Matt Caswell <matt@openssl.org>
Date: Fri, 14 Dec 2018 07:28:30 +0000
Subject: [PATCH] Go into the error state if a fatal alert is sent or received

If an application calls SSL_shutdown after a fatal alert has occured and
then behaves different based on error codes from that function then the
application may be vulnerable to a padding oracle.

CVE-2019-1559

Reviewed-by: Richard Levitte <levitte@openssl.org>
---
 ssl/d1_pkt.c |  1 +
 ssl/s3_pkt.c | 10 +++++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/ssl/d1_pkt.c b/ssl/d1_pkt.c
index 23aa9db..c7fe977 100644
--- a/ssl/d1_pkt.c
+++ b/ssl/d1_pkt.c
@@ -1309,6 +1309,7 @@ int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
             ERR_add_error_data(2, "SSL alert number ", tmp);
             s->shutdown |= SSL_RECEIVED_SHUTDOWN;
             SSL_CTX_remove_session(s->session_ctx, s->session);
+            s->state = SSL_ST_ERR;
             return (0);
         } else {
             al = SSL_AD_ILLEGAL_PARAMETER;
diff --git a/ssl/s3_pkt.c b/ssl/s3_pkt.c
index 6527df8..830b723 100644
--- a/ssl/s3_pkt.c
+++ b/ssl/s3_pkt.c
@@ -1500,6 +1500,7 @@ int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek)
             ERR_add_error_data(2, "SSL alert number ", tmp);
             s->shutdown |= SSL_RECEIVED_SHUTDOWN;
             SSL_CTX_remove_session(s->session_ctx, s->session);
+            s->state = SSL_ST_ERR;
             return (0);
         } else {
             al = SSL_AD_ILLEGAL_PARAMETER;
@@ -1719,9 +1720,12 @@ int ssl3_send_alert(SSL *s, int level, int desc)
                                           * protocol_version alerts */
     if (desc < 0)
         return -1;
-    /* If a fatal one, remove from cache */
-    if ((level == 2) && (s->session != NULL))
-        SSL_CTX_remove_session(s->session_ctx, s->session);
+    /* If a fatal one, remove from cache and go into the error state */
+    if (level == SSL3_AL_FATAL) {
+        if (s->session != NULL)
+            SSL_CTX_remove_session(s->session_ctx, s->session);
+        s->state = SSL_ST_ERR;
+    }
 
     s->s3->alert_dispatch = 1;
     s->s3->send_alert[0] = level;
-- 
2.7.4

/gnu/tests?id=bc8554ecb1c132629640f1e61dd2a7e7c9a92027'>tests</a>/<a href='/guix/log/gnu/tests/package-management.scm?id=bc8554ecb1c132629640f1e61dd2a7e7c9a92027'>package-management.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/tests/package-management.scm?id=bc8554ecb1c132629640f1e61dd2a7e7c9a92027&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-07-22 22:10:11 +0300'>2020-07-22</span></td><td><a href='/guix/commit/gnu/tests/package-management.scm?id=4656180d5de1fef2846bea9af27ae509f32376ba'>services: nix: Fix sandbox.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>