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FreeBSD: VID-9E2D0DCF-9926-11E8-A92D-0050562A4D7B (CVE-2018-10903): py-cryptography -- tag forgery vulnerability

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FreeBSD: VID-9E2D0DCF-9926-11E8-A92D-0050562A4D7B (CVE-2018-10903): py-cryptography -- tag forgery vulnerability

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:P/I:N/A:N)
Published
07/17/2018
Created
03/19/2019
Added
08/06/2018
Modified
05/07/2019

Description

A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. 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.

Solution(s)

  • freebsd-upgrade-package-py27-cryptography
  • freebsd-upgrade-package-py34-cryptography
  • freebsd-upgrade-package-py35-cryptography
  • freebsd-upgrade-package-py36-cryptography
  • freebsd-upgrade-package-py37-cryptography

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