Description
The asn1buf_skiptail function in the ASN.1 decoder library for MIT Kerberos 5 (krb5) 1.2.2 through 1.3.4 allows remote attackers to cause a denial of service (infinite loop) via a certain BER encoding.
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 | 1.3.4-3 | — |
| Debian 13 | krb5 | 1.3.4-3 | — |
| Debian 12 | krb5 | 1.3.4-3 | — |
| Debian 3.0 | krb5 | 1.2.4-5woody6 | DSA-543-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 3 | krb5 +4 | 1.2.7-28 | RHSA-2004:350 |
Advisories 2
- RHSA-2004:350 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-543-1 krb5 -- several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- CLA-2004:860 vendor-advisory
- kerberos-asn1-library-dos(17160) vdb-entry
- 11079 vdb-entry
- VU#550464 third-party-advisory
- RHSA-2004:350 vendor-advisory
- oval:org.mitre.oval:def:2139 vdb-entry signature
- 2004-0045 vendor-advisory
- DSA-543 vendor-advisory
- TA04-247A third-party-advisory
- GLSA-200409-09 vendor-advisory
- 20040913 [OpenPKG-SA-2004.039] OpenPKG Security Advisory (kerberos) mailing-list
- oval:org.mitre.oval:def:10014 vdb-entry signature
- http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-003-asn1.txt