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CVE-2013-4206

Date: August 19, 2013

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.

Severity Score

Related Resources (11)

http://svn.tartarus.org/sgt/putty/sshbn.c?sortby=date&r1=9977&r2=9976&pathrev=9977
http://www.openwall.com/lists/oss-security/2013/08/06/11
http://www.debian.org/security/2013/dsa-2736
http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
https://people.canonical.com/~ubuntu-security/cve/CVE-2013-4206
https://nvd.nist.gov/vuln/detail/CVE-2013-4206
https://security-tracker.debian.org/tracker/CVE-2013-4206
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.html
http://secunia.com/advisories/54533
http://secunia.com/advisories/54379
https://www.mend.io/vulnerability-database/CVE-2013-4206

Severity Score

Weakness Type (CWE)

Buffer Errors

CWE-119

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): LOW

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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