The InvertibleRWFunction::CalculateInverse function in rw.cpp in libcrypt++ 5.6.2 does not properly blind private key operations for the Rabin-Williams digital signature algorithm, which allows remote attackers to obtain private keys via a timing attack.

References

• https://nvd.nist.gov/vuln/detail/CVE-2015-2141
• weidai11/cryptopp@9425e16
• http://lists.opensuse.org/opensuse-updates/2015-07/msg00047.html
• http://sourceforge.net/p/cryptopp/code/542/
• http://www.debian.org/security/2015/dsa-3296
• http://www.securityfocus.com/bid/75467