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Last updated: 10/31/2014 2:25:54 PM

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National Cyber Awareness System

Vulnerability Summary for CVE-2013-4207

Original release date: 08/19/2013
Last revised: 09/11/2013
Source: US-CERT/NIST

Overview

Buffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) via an invalid DSA signature that is not properly handled during computation of a modular inverse and triggers the overflow during a division by zero by the bignum functionality, a different vulnerability than CVE-2013-4206.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 4.3 (MEDIUM) (AV:N/AC:M/Au:N/C:N/I:N/A:P) (legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows disruption of service

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External Source: MLIST
Name: [oss-security] 20130806 CVE request: three additional flaws fixed in putty 0.63
External Source: SECUNIA
Name: 54533
External Source: SUSE
Name: openSUSE-SU-2013:1347
External Source: DEBIAN
Name: DSA-2736
External Source: SECUNIA
Name: 54379
Type: Advisory
External Source: CONFIRM
Name: http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-bignum-division-by-zero.html
Type: Advisory

Technical Details

Vulnerability Type (View All)