|Bugzilla:||993031: CVE-2013-4206 CVE-2013-4207 CVE-2013-4208 CVE-2013-4852 putty: Integer overflow, leading to heap-based buffer overflow during SSH handshake|
The MITRE CVE dictionary describes this issue as:
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.
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