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CVE-2018-10903

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2018-3600-01
Posted Nov 14, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-3600-01 - The python-cryptography packages contain a Python Cryptographic Authority's cryptography library, which provides cryptographic primitives and recipes to Python developers. Issues addressed include a tag forgery vulnerability.

tags | advisory, python
systems | linux, redhat
advisories | CVE-2018-10903
SHA-256 | e06ef5a025c2fb21dd05ef7409e10e5310b636ef92cda32eddfb5efc0c1b4870
Ubuntu Security Notice USN-3720-1
Posted Jul 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3720-1 - It was discovered that python-cryptography incorrectly handled certain inputs. An attacker could possibly use this to get access to sensitive information.

tags | advisory, python
systems | linux, ubuntu
advisories | CVE-2018-10903
SHA-256 | d8b44664302f10984ac85d8e97b0556cc9e634645ffdba8f2bb2f87b340bb898
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