Description
The telnet daemon (telnetd) in MIT krb5 before 1.6.1 allows remote attackers to bypass authentication and gain system access via a username beginning with a '-' character, a similar issue to CVE-2007-0882.
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 | krb5 | 1.4.4-8 | — |
| Debian 13 | krb5 | 1.4.4-8 | — |
| Debian 12 | krb5 | 1.4.4-8 | — |
| Debian 4.0 | krb5 | 1.4.4-7etch1 | DSA-1276-1 |
| Debian 3.1 | krb5 | 1.3.6-2sarge4 | DSA-1276-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | krb5 +4 | 1.5-23 | RHSA-2007:0095 |
| RHEL 4 | krb5 +4 | 1.3.4-46 | RHSA-2007:0095 |
| RHEL 3 | krb5 +4 | 1.2.7-61 | RHSA-2007:0095 |
| RHEL 2 | krb5 +4 | 1.2.2-44 | RHSA-2007:0095 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.19.2-2.2 | openSUSE-SU-2024:10899-1 |
Advisories 3
- RHSA-2007:0095 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1276-1 krb5 - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10899-1 krb5-1.19.2-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- ADV-2007-1218 vdb-entry
- oval:org.mitre.oval:def:10046 vdb-entry signature
- 20070403 MITKRB5-SA-2007-001: telnetd allows login as arbitrary user [CVE-2007-0956] mailing-list
- 24706 third-party-advisory
- 24740 third-party-advisory
- RHSA-2007:0095 vendor-advisory
- VU#220816 third-party-advisory
- 24786 third-party-advisory
- TA07-093B third-party-advisory
- 20070405 FLEA-2007-0008-1: krb5 mailing-list
- DSA-1276 vendor-advisory
- 24735 third-party-advisory
- kerberos-telnet-security-bypass(33414) vdb-entry
- http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-001-telnetd.txt
- 1017848 vdb-entry
- 23281 vdb-entry
- 24750 third-party-advisory
- 24817 third-party-advisory
- 24757 third-party-advisory
- 24755 third-party-advisory
- ADV-2007-1249 vdb-entry
- 102867 vendor-advisory
- SUSE-SA:2007:025 vendor-advisory
- 24785 third-party-advisory
- MDKSA-2007:077 vendor-advisory
- USN-449-1 vendor-advisory
- 24736 third-party-advisory
- 20070404 rPSA-2007-0063-1 krb5 krb5-server krb5-services krb5-test krb5-workstation mailing-list
- GLSA-200704-02 vendor-advisory