Improper Input Validation Affecting python-cryptography package, versions <2.3-1
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Test your applications- Snyk ID SNYK-DEBIAN13-PYTHONCRYPTOGRAPHY-5693502
- published 22 Jul 2018
- disclosed 30 Jul 2018
Introduced: 22 Jul 2018
CVE-2018-10903 Open this link in a new tabHow to fix?
Upgrade Debian:13
python-cryptography
to version 2.3-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python-cryptography
package and not the python-cryptography
package as distributed by Debian
.
See How to fix?
for Debian:13
relevant fixed versions and status.
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
- https://security-tracker.debian.org/tracker/CVE-2018-10903
- https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903
- https://access.redhat.com/errata/RHSA-2018:3600
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-10903
- https://usn.ubuntu.com/3720-1/