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

s='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/scripts/guix.in?id=041a12c46b77094c3a89276cf55d9cf1f68fb9a3&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-11 19:06:53 +0100'>2020-12-11</span></td><td><a href='/guix/commit/scripts/guix.in?id=fd247542215fbd10f28980f3d5255014b150e95a'>build: 'script/guix' uses our own 'guile' executable.</a><span class='msg-avail'>...<span class='msg-tooltip'>* Makefile.am (do_subst): Substitute @abs_top_builddir@.
* scripts/guix.in: Use it.
</span></span></td><td>Ludovic Courtès</td></tr>