Description
The ssh_gssapi_parse_ename function in gss-serv.c in OpenSSH 5.8 and earlier, when gssapi-with-mic authentication is enabled, allows remote authenticated users to cause a denial of service (memory consumption) via a large value in a certain length field. NOTE: there may be limited scenarios in which this issue is relevant.
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 | 1:5.9p1-1 | — |
| Debian 13 | openssh | 1:5.9p1-1 | — |
| Debian 12 | openssh | 1:5.9p1-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | openssh +4 | 5.3p1-81.el6 | RHSA-2012:0884 |
| RHEL 6 | pam_ssh_agent_auth | 0.9-81.el6 | RHSA-2012:0884 |
Advisories 1
- RHSA-2012:0884 Red Hat Security Advisory: openssh security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- 20110801 Useless OpenSSH resources exhausion bug via GSSAPI mailing-list
- RHSA-2012:0884 vendor-advisory
- http://site.pi3.com.pl/adv/ssh_1.txt