Improper Input Validation Affecting python27-rsa package, versions <0:3.3-2.7.amzn1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN201803-PYTHON27RSA-1693698
- published27 Sept 2021
- disclosed13 Jan 2016
Introduced: 13 Jan 2016
CVE-2016-1494 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2018.03 python27-rsa to version 0:3.3-2.7.amzn1 or higher.
This issue was patched in ALAS-2016-644.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python27-rsa package and not the python27-rsa package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.
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
- http://www.securityfocus.com/bid/79829
- https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1494
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175897.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175942.html
- https://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa/
- http://www.openwall.com/lists/oss-security/2016/01/05/1
- http://www.openwall.com/lists/oss-security/2016/01/05/3
- http://lists.opensuse.org/opensuse-updates/2016-01/msg00032.html