CVE-2018-10903
7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| [UNKNOWN] | python-cryptography | 2.3 | affected |
Weaknesses
- CWE-20: CWE-20
ADP Enrichment
CVE Program Container
Additional References
- https://access.redhat.com/errata/RHSA-2018:3600
- https://usn.ubuntu.com/3720-1/
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903
- https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef
References
- https://access.redhat.com/errata/RHSA-2018:3600
- https://usn.ubuntu.com/3720-1/
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903
- https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef
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