fail2ban 0.7.4 and earlier 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.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Fail2ban | Fail2ban | * | 0.7.4 (including) |
References
- http://bugs.gentoo.org/show_bug.cgi?id=157166
- http://secunia.com/advisories/23237
- http://secunia.com/advisories/24184
- http://security.gentoo.org/glsa/glsa-200702-05.xml
- http://www.securityfocus.com/bid/21469
- http://www.vupen.com/english/advisories/2006/4877
- https://exchange.xforce.ibmcloud.com/vulnerabilities/30739
- http://bugs.gentoo.org/show_bug.cgi?id=157166
- http://secunia.com/advisories/23237
- http://secunia.com/advisories/24184
- http://security.gentoo.org/glsa/glsa-200702-05.xml
- http://www.securityfocus.com/bid/21469
- http://www.vupen.com/english/advisories/2006/4877
- https://exchange.xforce.ibmcloud.com/vulnerabilities/30739