PT-2016-4840 · Python+1 · Python-Rsa+1

Filippo Valsorda · Published 2016-01-12 · Updated 2022-05-14 · CVE-2016-1494

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Python-RSA versions prior to 3.3

Description The issue allows attackers to spoof signatures with a small public exponent via crafted signature padding, also known as a BERserk attack. This affects the verify function in the RSA package for Python.

Recommendations For versions prior to 3.3, update to version 3.3 or later to resolve the issue. As a temporary workaround, consider implementing additional signature verification checks to minimize the risk of exploitation.

Exploit

Fix

RCE

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-20

CWE-347

Related Identifiers

CVE-2016-1494

GHSA-8RJR-6QQ5-PJ9P

MGASA-2016-0011

PYSEC-2016-10

SUSE-SU-2016:0107-1

SUSE-SU-2016_0107-1

Affected Products

Python-Rsa

Suse

References · 28

• 🔥 https://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa · Exploit
• https://osv.dev/vulnerability/PYSEC-2016-10 · Vendor Advisory
• http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175942.html · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-8rjr-6qq5-pj9p · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-1494 · Security Note
• http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175897.html · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2016-0011 · Vendor Advisory
• https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff · Patch
• https://osv.dev/vulnerability/SUSE-SU-2016:0107-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2016-1494 · Security Note
• http://lists.opensuse.org/opensuse-updates/2016-01/msg00032.html · Vendor Advisory
• https://advisories.mageia.org/MGASA-2016-0011.html · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2016-1494 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2016-1494 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2016-1494 · Vendor Advisory