PuTTY 'modmul()' Function Buffer Underrun Vulnerability

Bugtraq ID:	61645
Class:	Design Error
CVE:	CVE-2013-4206
Remote:	Yes
Local:	No
Published:	Aug 06 2013 12:00AM
Updated:	Apr 13 2015 09:46PM
Credit:	Mark Wooding
Vulnerable:	Simon Tatham PuTTY 0.58 Simon Tatham PuTTY 0.57 Simon Tatham PuTTY 0.56 Simon Tatham PuTTY 0.55 Simon Tatham PuTTY 0.54 Simon Tatham PuTTY 0.53 b Simon Tatham PuTTY 0.53 Simon Tatham PuTTY 0.52 Simon Tatham PuTTY 0.61 Simon Tatham PuTTY 0.60 Simon Tatham PuTTY 0.59 Gentoo Linux FileZilla FileZilla 3.0.10 -rc2 FileZilla FileZilla 3.0.10 -rc1 FileZilla FileZilla 3.0.10 FileZilla FileZilla 3.0.9 FileZilla FileZilla 3.0 -beta5 FileZilla FileZilla 3.0 -beta4 FileZilla FileZilla 3.0 -beta3 FileZilla FileZilla 3.0 -beta2 FileZilla FileZilla 3.0 -beta1 FileZilla FileZilla 2.2.32 FileZilla FileZilla 2.2.31 FileZilla FileZilla 2.2.30 FileZilla FileZilla 2.2.29 FileZilla FileZilla 2.2.28 FileZilla FileZilla 2.2.27 FileZilla FileZilla 2.2.26 FileZilla FileZilla 2.2.25 FileZilla FileZilla 2.2.24 FileZilla FileZilla 2.2.23 FileZilla FileZilla 2.2.22 FileZilla FileZilla 2.2.15 FileZilla FileZilla 0.9.22 FileZilla FileZilla 0.9.21 FileZilla FileZilla 0.9.20 FileZilla FileZilla 2.2.30a FileZilla FileZilla 2.2.26a Debian Linux 6.0 sparc Debian Linux 6.0 s/390 Debian Linux 6.0 powerpc Debian Linux 6.0 mips Debian Linux 6.0 ia-64 Debian Linux 6.0 ia-32 Debian Linux 6.0 arm Debian Linux 6.0 amd64
Not Vulnerable:

PuTTY 'modmul()' Function Buffer Underrun Vulnerability

PuTTY is prone to a buffer-underrun vulnerability.

An attacker can exploit this issue to corrupt the heap and possibly to crash the application. Failed exploit attempts will result in a denial-of-service condition.

PuTTY 0.52 through versions prior to 0.63 are vulnerable.

PuTTY 'modmul()' Function Buffer Underrun Vulnerability

Currently, we are not aware of any working exploits. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

PuTTY 'modmul()' Function Buffer Underrun Vulnerability

Solution:
Updates are available. Please see the references or vendor advisory for more information.

PuTTY 'modmul()' Function Buffer Underrun Vulnerability

References:

• FileZilla HomePage (FileZilla)
  
• PuTTY Homepage (PuTTY Project)
  
• Re: CVE request: three additional flaws fixed in putty 0.63 (SecLists.Org)
  
• Revision 9977 (simon)
  
• TortoiseGit Release 1.8.5.0 (TortoiseGit)
  
• Vulnerability: buffer underrun in modmul can corrupt the heap (Mark Wooding)
  
• FileZilla: Multiple vulnerabilities (Gentoo Foundation)