PYSEC-2018-52

2018-07-3016:29:00

Google

osv.dev

0.002 Low

EPSS

Percentile

55.3%

JSON

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.

CPENameOperatorVersion
cryptographyeq2.1.2
cryptographyeq2.0.3
cryptographyeq2.1.4
cryptographyeq2.2.1
cryptographyeq2.0.2
cryptographyeq2.2
cryptographyeq2.1.1
cryptographyeq2.1
cryptographyeq2.0
cryptographyeq2.0.1

Name	Operator	Version
cryptography	eq	2.1.2
cryptography	eq	2.0.3
cryptography	eq	2.1.4
cryptography	eq	2.2.1
cryptography	eq	2.0.2
cryptography	eq	2.2
cryptography	eq	2.1.1
cryptography	eq	2.1
cryptography	eq	2.0
cryptography	eq	2.0.1