Heap-based Buffer Overflows in PuTTY modpow Function

CVE-2004-1440 · HIGH Severity

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

Multiple heap-based buffer overflows in the modpow function in PuTTY before 0.55 allow (1) remote attackers to execute arbitrary code via an SSH2 packet with a base argument that is larger than the mod argument, which causes the modpow function to write memory before the beginning of its buffer, and (2) remote malicious servers to cause a denial of service (client crash) and possibly execute arbitrary code via a large bignum during authentication.

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