Bug 159208

Summary: CAN-2005-1267 tcpdump BGP DoS
Product: Red Hat Enterprise Linux 4 Reporter: Josh Bressers <bressers>
Component: tcpdumpAssignee: Martin Stransky <stransky>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: medium    
Version: 4.0CC: security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=low,source=vendorsec,reported=20050531,public=20050606
Fixed In Version: RHSA-2005-505 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2005-06-13 12:03:32 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Attachments:
Description Flags
Patch from upstream
none
Proof of concept exploit none

Description Josh Bressers 2005-05-31 16:11:32 UTC
Simon L. Nielsen alerted vendor-sec to this issue:

While working on the FreeBSD Security Advisory for the recent tcpdump
issues (CAN-2005-1278, CAN-2005-1279, and CAN-2005-1280) I noticed
that there is another similar infinite loop DoS vulnerability in the
BGP handling code.

The problem lies in bgp_update_print() in print-bgp.c around line
1652, where the -1 return value from decode_prefix4() is not properly
handled.

This problem was fixed in tcpdump CVS repository in print-bgp.c
v. 1.95 on May 5, but it hasn't gone to the tcpdump 3.8 branch, and
hasn't been included in any of the vendor patch sets for earlier DoS
vulnerabilities that I have seen.

Comment 1 Josh Bressers 2005-05-31 16:12:22 UTC
This issue should also affect RHEL2.1 and RHEL3

Comment 2 Josh Bressers 2005-05-31 16:13:04 UTC
Created attachment 115005 [details]
Patch from upstream

Comment 3 Josh Bressers 2005-05-31 16:14:39 UTC
Created attachment 115006 [details]
Proof of concept exploit

Comment 4 Martin Stransky 2005-06-01 08:03:02 UTC
When will the embargo expire?

Comment 5 Josh Bressers 2005-06-01 11:24:41 UTC
There is no set date yet.  I'll let you know as soon as there is one.
 I expect it to be soon.  This fix is already in the upstream CVS, so
it makes little sense to try to keep it a secret for too long.

Comment 6 Mark J. Cox 2005-06-06 08:39:02 UTC
Removing embargo as per Simon Nielsen msg to vendor-sec

Comment 7 Martin Stransky 2005-06-08 08:34:20 UTC
RHEL2.1 and RHEL3 aren't affected by this issue, the bug is only in
version 3.8.2.

Comment 8 Josh Bressers 2005-06-13 12:03:32 UTC
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2005-505.html