DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a login name containing certain strings with an IP address, which is not properly handled by a regular expression.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Denyhosts | Denyhosts | 2.5 (including) | 2.5 (including) |
| Denyhosts | Ubuntu | devel | * |
| Denyhosts | Ubuntu | edgy | * |
| Denyhosts | Ubuntu | feisty | * |
| Denyhosts | Ubuntu | gutsy | * |
| Denyhosts | Ubuntu | upstream | * |
References
- http://bugs.gentoo.org/show_bug.cgi?id=157163
- http://secunia.com/advisories/23236
- http://secunia.com/advisories/23603
- http://security.gentoo.org/glsa/glsa-200701-01.xml
- http://www.securityfocus.com/bid/21468
- http://www.vupen.com/english/advisories/2006/4876
- https://exchange.xforce.ibmcloud.com/vulnerabilities/30761
- http://bugs.gentoo.org/show_bug.cgi?id=157163
- http://secunia.com/advisories/23236
- http://secunia.com/advisories/23603
- http://security.gentoo.org/glsa/glsa-200701-01.xml
- http://www.securityfocus.com/bid/21468
- http://www.vupen.com/english/advisories/2006/4876
- https://exchange.xforce.ibmcloud.com/vulnerabilities/30761