CVE-2018-10903: Input Validation
First published: Wed Jul 18 2018(Updated: )
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. Upstream patch: <a href="https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef">https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef</a> References: <a class="bz_bug_link bz_status_CLOSED bz_closed bz_public " title="CLOSED ERRATA - Possible tag truncation security bug in AEAD API" href="show_bug.cgi?id=1602752">https://bugzilla.redhat.com/show_bug.cgi?id=1602752</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cryptography Python-cryptography | >=1.9.0<2.3 | |
| Redhat Openstack | =13 | |
| Canonical Ubuntu Linux | =18.04 | |
| redhat/python-cryptography | <2.3 | 2.3 |
| pip/cryptography | >=1.9.0<2.3 | 2.3 |
| debian/python-cryptography | 3.3.2-1 38.0.4-3 38.0.4-3~deb12u1 42.0.5-2 43.0.0-1 |
Remedy
https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef
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Reference Links
- https://access.redhat.com/errata/RHSA-2018:3600
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903
- https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19ef
- https://usn.ubuntu.com/3720-1/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1602752
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1605041
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1602931#c8
- https://bugzilla.redhat.com/show_bug.cgi?id=1602931
- https://launchpad.net/bugs/cve/CVE-2018-10903
- https://nvd.nist.gov/vuln/detail/CVE-2018-10903
- https://github.com/pyca/cryptography/pull/4342
- https://github.com/pyca/cryptography/commit/d4378e42937b56f473ddade2667f919ce32208cb
- https://github.com/advisories/GHSA-fcf9-3qw3-gxmj (Advisory)
- https://github.com//pyca/cryptography/pull/4342
- https://security-tracker.debian.org/tracker/CVE-2018-10903
- https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2018-52.yaml
- https://usn.ubuntu.com/3720-1
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10903
- https://ubuntu.com/security/CVE-2018-10903
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