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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 12 | all | putty | < 0.56-1 | putty_0.56-1_all.deb |
Debian | 11 | all | putty | < 0.56-1 | putty_0.56-1_all.deb |
Debian | 10 | all | putty | < 0.56-1 | putty_0.56-1_all.deb |
Debian | 999 | all | putty | < 0.56-1 | putty_0.56-1_all.deb |
Debian | 13 | all | putty | < 0.56-1 | putty_0.56-1_all.deb |