In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, remote attackers can cause a denial of service (NULL pointer dereference and application crash) against directory authorities via a malformed descriptor, aka TROVE-2017-010.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Tor | Tor_project | * | 0.2.5.16 (excluding) |
| Tor | Tor_project | 0.2.6 (including) | 0.2.8.17 (excluding) |
| Tor | Tor_project | 0.2.9 (including) | 0.2.9.14 (excluding) |
| Tor | Tor_project | 0.3.0 (including) | 0.3.0.13 (excluding) |
| Tor | Tor_project | 0.3.1 (including) | 0.3.1.9 (excluding) |
| Tor | Ubuntu | artful | * |
| Tor | Ubuntu | esm-apps/xenial | * |
| Tor | Ubuntu | upstream | * |
| Tor | Ubuntu | xenial | * |
| Tor | Ubuntu | zesty | * |
Potential Mitigations
References
- https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516
- https://bugs.torproject.org/24245
- https://www.debian.org/security/2017/dsa-4054
- https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516
- https://bugs.torproject.org/24245
- https://www.debian.org/security/2017/dsa-4054