An error-handling flaw was found in python-ecdsa before version 0.13.3. During signature decoding, malformed DER signatures could raise unexpected exceptions (or no exceptions at all), which could lead to a denial of service.
Weakness
[PLANNED FOR DEPRECATION. SEE MAINTENANCE NOTES AND CONSIDER CWE-252, CWE-248, OR CWE-1069.] Ignoring exceptions and other error conditions may allow an attacker to induce unexpected behavior unnoticed.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Python-ecdsa | Python-ecdsa_project | * | 0.13.3 (excluding) |
| Red Hat Satellite 6.10 for RHEL 7 | RedHat | python-ecdsa-0:0.13.3-2.el7pc | * |
| Red Hat Satellite 6.10 for RHEL 7 | RedHat | python-ecdsa-0:0.13.3-2.el7pc | * |
| Python-ecdsa | Ubuntu | bionic | * |
| Python-ecdsa | Ubuntu | disco | * |
| Python-ecdsa | Ubuntu | eoan | * |
| Python-ecdsa | Ubuntu | esm-apps/bionic | * |
| Python-ecdsa | Ubuntu | esm-infra/xenial | * |
| Python-ecdsa | Ubuntu | trusty | * |
| Python-ecdsa | Ubuntu | upstream | * |
| Python-ecdsa | Ubuntu | xenial | * |
Potential Mitigations
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14853
- https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3
- https://seclists.org/bugtraq/2019/Dec/33
- https://www.debian.org/security/2019/dsa-4588
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14853
- https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3
- https://seclists.org/bugtraq/2019/Dec/33
- https://www.debian.org/security/2019/dsa-4588