Buffer Overflow in PuTTY SSHbn.c Allows Remote Denial of Service

CVE-2013-4207 · MEDIUM Severity

AV:N/AC:M/AU:N/C:N/I:N/A:P

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.

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