Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2013-4206

Severity CVSS v4.0:
Pending analysis
Type:
CWE-119 Buffer Errors
Publication date:
19/08/2013
Last modified:
11/04/2025

Description

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.

Impact

Vector 2.0
AV:N/AC:M/Au:N/C:P/I:P/A:P CVSS v2.0 Severity and Metrics:

Base Score: 6.80 MEDIUM
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): Physical
Availability (A): Physical

Base Score 2.0
6.80
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:putty:putty:0.45:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.46:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.47:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.48:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.49:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.50:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.51:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.52:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.53b:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.54:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.55:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.56:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.57:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.58:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.59:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools