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Red Hat Bugzilla – Attachment 645002 Details for
Bug 871620
CVE-2012-4562 libssh: multiple improper overflow checks
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[patch]
CVE-2012-4562-Fix-possible-integer-overflow-in-ssh_g.patch
0001-CVE-2012-4562-Fix-possible-integer-overflow-in-ssh_g.patch (text/plain), 897 bytes, created by
Andreas Schneider
on 2012-11-14 16:46:24 UTC
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Description:
CVE-2012-4562-Fix-possible-integer-overflow-in-ssh_g.patch
Filename:
MIME Type:
Creator:
Andreas Schneider
Created:
2012-11-14 16:46:24 UTC
Size:
897 bytes
patch
obsolete
>From 8489521c0d7a9d1336b23a4a64e5df2d0f3ba57a Mon Sep 17 00:00:00 2001 >From: Xi Wang <xi.wang@gmail.com> >Date: Fri, 25 Nov 2011 23:02:06 -0500 >Subject: [PATCH 01/13] CVE-2012-4562: Fix possible integer overflow in > ssh_get_hexa(). > >No exploit known, but it is better to check the string length. > >Signed-off-by: Andreas Schneider <asn@cryptomilk.org> >--- > src/dh.c | 4 ++++ > 1 file changed, 4 insertions(+) > >diff --git a/src/dh.c b/src/dh.c >index ec291d3..9b9d203 100644 >--- a/src/dh.c >+++ b/src/dh.c >@@ -44,6 +44,7 @@ > #include <stdio.h> > #include <stdlib.h> > #include <string.h> >+#include <limits.h> > > #ifndef _WIN32 > #include <netinet/in.h> >@@ -194,6 +195,9 @@ char *ssh_get_hexa(const unsigned char *what, size_t len) { > char *hexa = NULL; > size_t i; > >+ if (len > (UINT_MAX - 1) / 3) >+ return NULL; >+ > hexa = malloc(len * 3 + 1); > if (hexa == NULL) { > return NULL; >-- >1.8.0 >
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