CVE-2018-10903
unknown
CVSS v3
—
CVSS v2
—
VIR risk
—
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.
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-10903
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2018-10903.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 2.3-1 |
| debian | bullseye | fixed | 2.3-1 |
| debian | forky | fixed | 2.3-1 |
| debian | sid | fixed | 2.3-1 |
| debian | trixie | fixed | 2.3-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| PyPI | cryptography | >=1.9.0,<2.3 | 2.3 |
| PyPI | cryptography | >=1.9,<2.3 | 2.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2018-10903
- https://github.com/pyca/cryptography/pull/4342
- https://github.com/pyca/cryptography/commit/d4378e42937b56f473ddade2667f919ce32208cb
- https://access.redhat.com/errata/RHSA-2018:3600
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903
- https://github.com/advisories/GHSA-fcf9-3qw3-gxmj
- https://github.com/pyca/cryptography
- https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2018-52.yaml
- https://usn.ubuntu.com/3720-1
- https://www.suse.com/security/cve/CVE-2018-10903.html
- https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef
- https://usn.ubuntu.com/3720-1/
- https://security-tracker.debian.org/tracker/CVE-2018-10903
Verify integrity in audit chain (admin only). AS-IS.