CVE-2013-6890
Description
denyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs, which allows remote attackers to cause a denial of service (incorrect block of IP addresses) via crafted login names.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
DenyHosts - 'regex.py' Remote Denial of Service
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | 6.0 | affected | |
| debian | 7.0 | affected | |
| debian | 7.1 | affected | |
| fedora | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| phil_schwartz | denyhosts | 2.6 | |
References
- http://seclists.org/oss-sec/2013/q4/535
- http://secunia.com/advisories/56239
- http://www.debian.org/security/2013/dsa-2826
- https://bugzilla.redhat.com/show_bug.cgi?id=1045982
- http://seclists.org/oss-sec/2013/q4/535
- http://secunia.com/advisories/56239
- http://www.debian.org/security/2013/dsa-2826
- https://bugzilla.redhat.com/show_bug.cgi?id=1045982
CWEs
CWE-287
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.