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Ubuntu: USN-3720-1 (CVE-2018-10903): python-cryptography vulnerability

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Ubuntu: USN-3720-1 (CVE-2018-10903): python-cryptography vulnerability

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:P/I:N/A:N)
Published
07/23/2018
Created
03/19/2019
Added
08/02/2018
Modified
03/02/2020

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)

  • ubuntu-upgrade-python-cryptography
  • ubuntu-upgrade-python3-cryptography

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