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CVE-2013-4207

4.3 · MEDIUM

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 modu…

Published Aug 19, 2013puttyCWE-119EPSS 1.83%

Overview

CVE-2013-4207 is a medium-severity vulnerability affecting putty putty. It was published on August 19, 2013 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from putty. Update putty to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
simon_tathamputty0Affected

References

Reflists.opensuse.org/opensuse-updates/2013-08/msg00035.htmlRefsecunia.com/advisories/54379Refsecunia.com/advisories/54533Refwww.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-bignum-division-by-zero.htmlRefwww.debian.org/security/2013/dsa-2736Refwww.openwall.com/lists/oss-security/2013/08/06/11Reflists.opensuse.org/opensuse-updates/2013-08/msg00035.htmlRefsecunia.com/advisories/54379Refsecunia.com/advisories/54533Refwww.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-bignum-division-by-zero.html

How CyberStrike helps

Frequently asked questions

What is CVE-2013-4207?

CVE-2013-4207 is a medium-severity vulnerability affecting putty putty. It was published on August 19, 2013 and has a CVSS 2.0 base score of 4.3 (MEDIUM).

How severe is CVE-2013-4207?

This vulnerability has a CVSS 2.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2013-4207?

Check the references section for vendor advisories and patches from putty. Update putty to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2013-4207?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2013-4207 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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