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.
References
Link | Resource |
---|---|
https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef | Patch Third Party Advisory |
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903 | Issue Tracking Patch Third Party Advisory |
https://usn.ubuntu.com/3720-1/ | Third Party Advisory |
https://access.redhat.com/errata/RHSA-2018:3600 |
Information
Published : 2018-07-30 09:29
Updated : 2021-08-04 10:14
NVD link : CVE-2018-10903
Mitre link : CVE-2018-10903
JSON object : View
CWE
CWE-20
Improper Input Validation
Products Affected
cryptography
- python-cryptography
canonical
- ubuntu_linux
redhat
- openstack