Description
OpenSSH on FreeBSD 5.3 and 5.4, when used with OpenPAM, does not properly handle when a forked child process terminates during PAM authentication, which allows remote attackers to cause a denial of service (client connection refusal) by connecting multiple times to the SSH server, waiting for the password prompt, then disconnecting.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openssh | 1:3.8.1p1-4 | — |
| Debian 13 | openssh | 1:3.8.1p1-4 | — |
| Debian 12 | openssh | 1:3.8.1p1-4 | — |
References
- ADV-2006-0805 vdb-entry
- 23797 vdb-entry
- 1015706 vdb-entry
- 520 third-party-advisory
- 16892 vdb-entry
- openssh-openpam-dos(25116) vdb-entry
- http://bugzilla.mindrot.org/show_bug.cgi?id=839