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.
Advisories
Source ID Title
Debian DSA Debian DSA DSA-2736-1 putty security update
EUVD EUVD EUVD-2013-4111 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.
Fixes

Solution

No solution given by the vendor.


Workaround

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History

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2024-08-06T16:38:01.677Z

Reserved: 2013-06-12T00:00:00

Link: CVE-2013-4206

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2013-08-19T23:55:08.723

Modified: 2025-04-11T00:51:21.963

Link: CVE-2013-4206

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses