- markus@cvs.openbsd.org 2011/08/01 19:18:15

     [gss-serv.c]
     prevent post-auth resource exhaustion (int overflow leading to 4GB malloc);
     report Adam Zabrock; ok djm@, deraadt@

2 files changed, 7 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index ccca485f..8b4676cf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -13,6 +13,10 @@
      fail open(2) with EPERM rather than SIGKILLing the whole process. libc
      will call open() to do strerror() when NLS is enabled;
      feedback and ok markus@
+   - markus@cvs.openbsd.org 2011/08/01 19:18:15
+     [gss-serv.c]
+     prevent post-auth resource exhaustion (int overflow leading to 4GB malloc);
+     report Adam Zabrock; ok djm@, deraadt@
 
 20110624
  - (djm) [configure.ac Makefile.in sandbox-darwin.c] Add a sandbox for
diff --git a/gss-serv.c b/gss-serv.c
index 2ec7ea19..c719c130 100644
--- a/gss-serv.c
+++ b/gss-serv.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: gss-serv.c,v 1.22 2008/05/08 12:02:23 djm Exp $ */
+/* $OpenBSD: gss-serv.c,v 1.23 2011/08/01 19:18:15 markus Exp $ */
 
 /*
  * Copyright (c) 2001-2003 Simon Wilkinson. All rights reserved.
@@ -229,6 +229,8 @@ ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name)
 	name->length = get_u32(tok+offset);
 	offset += 4;
 
+	if (UINT_MAX - offset < name->length)
+		return GSS_S_FAILURE;
 	if (ename->length < offset+name->length)
 		return GSS_S_FAILURE;