Mageia: 2018-0429 Severe: Python-Cryptography Tag Length Vulnerability
mageia
November 3, 2018
The python-cryptography and python-cryptography-vectors packages have been updated to version 2.3.1 and fixes the following security issue: The finalize_with_tag API did not enfor...
Summary
The python-cryptography and python-cryptography-vectors packages have
been updated to version 2.3.1 and fixes the following security issue:
The finalize_with_tag API did not enforce a minimum tag length. If a
user did not validate the input length prior to passing it to
finalize_with_tag an attacker could craft an invalid payload with a
shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance
of passing the MAC check. GCM tag forgeries can cause key leakage
(CVE-2018-10903).
References
- https://bugs.mageia.org/show_bug.cgi?id=23339
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/VKC5JVSO26YBOAYNY4HDSDFREMO4DS67/
- https://www.cve.org/CVERecord?id=CVE-2018-10903
Resolution
SRPMS
- 6/core/python-cryptography-2.3.1-1.mga6
- 6/core/python-cryptography-vectors-2.3.1-1.mga6
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Publication date: 03 Nov 2018
URL: https://advisories.mageia.org/MGASA-2018-0429.html
Type: security
CVE: CVE-2018-10903
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