Bug 70674 – net-irc/bnc: Buffer overflow vulnerability

• Product: Gentoo Security
• Status: RESOLVED FIXED

[Description Luke Macken (RETIRED) 2004-11-10 08:30:45 UTC]

TITLE:
BNC IRC proxy "getnickuserhost()" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA13149

VERIFY ADVISORY:
http://secunia.com/advisories/13149/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
From remote

SOFTWARE:
BNC IRC proxy 2.x
http://secunia.com/product/1622/

DESCRIPTION:
Leon Juranic has reported a vulnerability in BNC IRC proxy, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.

The vulnerability is caused due to some boundary errors in the "getnickuserhost()" function in "cmds.c" when processing IRC server responses. This can be exploited by a malicious server to cause a buffer overflow.

Successful exploitation crashes the process but may potentially also allow execution of arbitrary code.

The vulnerability has been reported in version 2.8.9. Other versions may also be affected.

SOLUTION:
Update to version 2.9.0:
http://www.gotbnc.com/files/bnc2.9.0.tar.gz

PROVIDED AND/OR DISCOVERED BY:
Leon Juranic

ORIGINAL ADVISORY:
http://security.lss.hr/en/index.php?page=details&ID=LSS-2004-11-03

[Comment 1 Luke Macken (RETIRED) 2004-11-10 08:33:07 UTC]

Changelog:

2.9.1

   1. SECURITY FIX: password check, was only letting incorrect passwords in
   2. Fixed IP binding on listen 

2.9.0

   1. Added trailing newlines to log records
   2. Added extra error handling on accepting connections
   3. Fixed buffer overflow in getnickuserhost (reported by Leon Juranic)
   4. Added extra check for gethostbyname2
   5. Made password check more thorough
   6. Fixed ipv6 dns resolving to random ipv4 

===

This advisory is about the buffer overflow fix in 2.9.0, but 2.9.1 also fixes another security issue.


Vapier, please bump to 2.9.1.

[Comment 2 SpanKY 2004-11-10 12:13:33 UTC]

2.9.1 is now in portage

[Comment 3 Luke Macken (RETIRED) 2004-11-10 15:04:11 UTC]

archs, please mark stable.

[Comment 4 Jason Wever (RETIRED) 2004-11-10 20:32:30 UTC]

Stable on sparc

[Comment 5 Jochen Maes (RETIRED) 2004-11-11 06:24:57 UTC]

stable on ppc

[Comment 6 Bryan Østergaard (RETIRED) 2004-11-11 11:20:08 UTC]

Stable on alpha.

[Comment 7 Sune Kloppenborg Jeppesen (RETIRED) 2004-11-12 15:44:46 UTC]

GLSA drafted Security please review.

[Comment 8 Sune Kloppenborg Jeppesen (RETIRED) 2004-11-16 02:16:33 UTC]

GLSA 200411-24