Buffer overflow in PuTTY - CVE-2013-4206
Published: August 20, 2013 / Updated: August 10, 2020
Vulnerability identifier: #VU42655
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2013-4206
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Simon Tatham
Affected software:
PuTTY
PuTTY
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
Heap-based buffer underflow in the modmul function in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) and possibly trigger memory corruption or code execution via a crafted DSA signature, which is not properly handled when performing certain bit-shifting operations during modular multiplication.
How to mitigate CVE-2013-4206
Install update from vendor's website.
Sources
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
- http://secunia.com/advisories/54379
- http://secunia.com/advisories/54533
- http://svn.tartarus.org/sgt/putty/sshbn.c?sortby=date&r1=9977&r2=9976&pathrev=9977
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.html
- http://www.debian.org/security/2013/dsa-2736
- http://www.openwall.com/lists/oss-security/2013/08/06/11