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CVE-2013-4206

CVE-2013-4206

EPSS 2.5%
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.
Affected products
n/a · n/a

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References
http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.htmlhttp://secunia.com/advisories/54379http://secunia.com/advisories/54533http://svn.tartarus.org/sgt/putty/sshbn.c?sortby=date&r1=9977&r2=9976&pathrev=9977http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.htmlhttp://www.debian.org/security/2013/dsa-2736http://www.openwall.com/lists/oss-security/2013/08/06/11