The verify function in the RSA package for Python (Python-RSA) before 3.3 allows attackers to spoof signatures with a small public exponent via crafted signature padding, aka a BERserk attack.

References

• https://nvd.nist.gov/vuln/detail/CVE-2016-1494
• https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff
• http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175897.html
• http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175942.html
• http://lists.opensuse.org/opensuse-updates/2016-01/msg00032.html
• http://www.openwall.com/lists/oss-security/2016/01/05/1
• http://www.openwall.com/lists/oss-security/2016/01/05/3
• sybrenstuvel/python-rsa@ab5d21c
• https://web.archive.org/web/20210123020914/http://www.securityfocus.com/bid/79829
• https://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa