| Package | Affected versions | Patched versions |
|---|---|---|
| putty | = 0.48= 0.49= 0.50= 0.51= 0.52= 0.53= 0.53b= 0.54 |
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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