CVE-2013-4208

Severity: low (CVSS 2.1 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-08-19 · updated 2026-06-16
Weakness: CWE-200

Description

The rsa_verify function in PuTTY before 0.63 (1) does not clear sensitive process memory after use and (2) does not free certain structures containing sensitive process memory, which might allow local users to discover private RSA and DSA keys.

Affected products

PuTTY: 0.45, 0.46, 0.47, 0.48, 0.49, 0.50 (+11)
Simon Tatham Putty: through 0.62; 0.53

References

http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
http://secunia.com/advisories/54379
http://secunia.com/advisories/54533
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/private-key-not-wiped.html
http://www.debian.org/security/2013/dsa-2736
http://www.openwall.com/lists/oss-security/2013/08/06/11
http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
http://secunia.com/advisories/54379
http://secunia.com/advisories/54533
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/private-key-not-wiped.html
http://www.debian.org/security/2013/dsa-2736
http://www.openwall.com/lists/oss-security/2013/08/06/11

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