Bug 159209 - CAN-2005-1267 tcpdump BGP DoS
CAN-2005-1267 tcpdump BGP DoS
Status: CLOSED RAWHIDE
Product: Fedora
Classification: Fedora
Component: tcpdump (Show other bugs)
3
All Linux
medium Severity low
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Assigned To: Martin Stransky
impact=low,source=vendorsec,reported=...
: Security
Depends On:
Blocks:
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Reported: 2005-05-31 12:17 EDT by Josh Bressers
Modified: 2007-11-30 17:11 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2005-06-08 04:35:24 EDT
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Description Josh Bressers 2005-05-31 12:17:59 EDT
+++ This bug was initially created as a clone of Bug #159208 +++

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 12:22:35 EDT
This issue should also affect FC4
Comment 2 Josh Bressers 2005-05-31 12:23:41 EDT
The upstream patch is attachment 115005 [details]
The demo exploit is attachment 115006 [details]
Comment 3 Mark J. Cox (Product Security) 2005-06-06 04:40:00 EDT
Removing embargo as per Simon Nielsen msg to vendor-sec
Comment 4 Josh Bressers 2005-06-09 13:34:06 EDT
Martin,

Has this update made its way to FC4 by chance?
Comment 5 Martin Stransky 2005-06-10 03:10:53 EDT
Update for FC4 is done (ID's 407).

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