CVE-2013-4206

Summary

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 Software

Weaknesses

• n/a

ADP Enrichment

CVE Program Container

Additional References

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

References

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

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