MGASA-2018-0429 - Updated python-cryptography packages fix security vulnerability

Publication date: 03 Nov 2018
URL: https://advisories.mageia.org/MGASA-2018-0429.html
Type: security
Affected Mageia releases: 6
CVE: CVE-2018-10903

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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10903

SRPMS:
- 6/core/python-cryptography-2.3.1-1.mga6
- 6/core/python-cryptography-vectors-2.3.1-1.mga6

Mageia 2018-0429: python-cryptography security update

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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10903

Resolution

MGASA-2018-0429 - Updated python-cryptography packages fix security vulnerability

SRPMS

- 6/core/python-cryptography-2.3.1-1.mga6

- 6/core/python-cryptography-vectors-2.3.1-1.mga6

Severity
Publication date: 03 Nov 2018
URL: https://advisories.mageia.org/MGASA-2018-0429.html
Type: security
CVE: CVE-2018-10903

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