CVE-2004-1440
HighSummary
Multiple heap-based buffer overflows in the modpow function in PuTTY before 0.55 allow remote attackers to execute arbitrary code via an SSH2 packet with a base argument larger than the mod argument, and malicious servers to cause a denial of service or possibly execute arbitrary code via a large bignum during authentication.
Risk Assessment
The risk includes remote code execution on the PuTTY client and potential denial of service attacks, which could lead to system compromise or disruption.
Recommendation
Immediately upgrade PuTTY to version 0.55 or later, which addresses this vulnerability.
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Original NVD description (English source)
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.