PT-2013-4897 · Simon Tatham · Putty

Mark Wooding · Published 2013-08-09 · Updated 2024-06-15 · CVE-2013-4206

Positive Technologies (AI Summary)

CVSS v2.0

6.8

Medium

Base vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

Name of the Vulnerable Software and Affected Versions PuTTY versions prior to 0.63

Description A heap-based buffer underflow issue exists in the modmul function in sshbn.c, which can be triggered by remote SSH servers sending a crafted DSA signature. This can cause a denial of service (crash) and potentially lead to memory corruption or code execution due to improper handling of certain bit-shifting operations during modular multiplication.

Recommendations For versions prior to 0.63, update to version 0.63 or later to resolve the issue.

Fix

DoS

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

CVE-2013-4206

DSA-2736-1

MGASA-2013-0242

OPENSUSE-SU-2024:10399-1

Affected Products

Putty

References · 24

• https://nvd.nist.gov/vuln/detail/CVE-2013-4206 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2013-4206 · Vendor Advisory
• http://secunia.com/advisories/54379 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2013-0242.html · Security Note
• http://chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2013-4206 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2013-0242 · Vendor Advisory
• http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html · Vendor Advisory
• http://svn.tartarus.org/sgt/putty/sshbn.c?sortby=date&r1=9977&r2=9976&pathrev=9977 · Patch
• http://debian.org/security/2013/dsa-2736 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2013-4206 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:10399-1 · Vendor Advisory
• http://chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-bignum-division-by-zero.html · Note
• http://chiark.greenend.org.uk/~sgtatham/putty/wishlist/private-key-not-wiped.html · Note
• http://openwall.com/lists/oss-security/2013/08/06/11 · Note