GitHub Advisoryadvisory · PyPI
GHSA-fcf9-3qw3-gxmj PyCA Cryptography vulnerable to GCM tag forgery
HIGH
Official page ↗
- Aliases
- CVE-2018-10903
- Ecosystem
- PyPI
- Packages
- cryptography
- Severity
- High
- CVSS vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-20
- Reviewed
- 2020-06-16
Affected packages
• PyPI cryptography: >= 1.9.0, < 2.3 → fixed in 2.3
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.
Related
Alias · CVE (1)
- CVE-2018-10903 A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. vulnerability
Weakness · CWE (1)
- CWE-20 Improper Input Validation weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2018-10903 advisory
- https://github.com/pyca/cryptography/pull/4342 web
- https://github.com/pyca/cryptography/commit/d4378e42937b56f473ddade2667f919ce32208cb web
- https://access.redhat.com/errata/RHSA-2018:3600 web
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903 web
- https://github.com/advisories/GHSA-fcf9-3qw3-gxmj advisory
- https://github.com/pyca/cryptography package
- https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2018-52.yaml web
- https://usn.ubuntu.com/3720-1 web