Description
Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3 through 1.6.3, and 1.7 before 1.7.1, allow remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code by providing ciphertext with a length that is too short to be valid.
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 | 1.8+dfsg~alpha1-1 | — |
| Debian 13 | krb5 | 1.8+dfsg~alpha1-1 | — |
| Debian 12 | krb5 | 1.8+dfsg~alpha1-1 | — |
| Debian 5.0 | krb5 | 1.6.dfsg.4~beta1-5lenny2 | DSA-1969-1 |
| Debian 4.0 | krb5 | 1.4.4-7etch8 | DSA-1969-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | krb5 +4 | 1.6.1-36.el5_4.1 | RHSA-2010:0029 |
| RHEL 4 | krb5 +4 | 1.3.4-62.el4_8.1 | RHSA-2010:0029 |
| RHEL 3 | krb5 +4 | 1.2.7-71 | RHSA-2010:0029 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5.3 EUS | krb5 +4 | 1.6.1-31.el5_3.4 | RHSA-2010:0029 |
| RHEL 5.2 EUS | krb5 +4 | 1.6.1-25.el5_2.3 | RHSA-2010:0029 |
| RHEL 4.7 EUS | krb5 +4 | 1.3.4-60.el4_7.3 | RHSA-2010:0029 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 3
- RHSA-2010:0029 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DSA-1969-1 krb5 - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10004-1 krb5-1.15-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- APPLE-SA-2010-06-15-1 vendor-advisory
- 38140 third-party-advisory
- ADV-2010-0096 vdb-entry
- http://support.avaya.com/css/P8/documents/100074869
- 38126 third-party-advisory
- DSA-1969 vendor-advisory
- ADV-2010-1481 vdb-entry
- USN-881-1 vendor-advisory
- SSRT100495 vendor-advisory
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-004.txt
- FEDORA-2010-0503 vendor-advisory
- MDVSA-2010:006 vendor-advisory
- 1023440 vdb-entry
- 38080 third-party-advisory
- 275530 vendor-advisory
- 1021779 vendor-advisory
- oval:org.mitre.oval:def:8192 vdb-entry signature
- 38203 third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=545015
- FEDORA-2010-0515 vendor-advisory
- http://support.apple.com/kb/HT4188
- 40220 third-party-advisory
- 38108 third-party-advisory
- 37749 vdb-entry
- oval:org.mitre.oval:def:11272 vdb-entry signature
- RHSA-2010:0029 vendor-advisory
- RHSA-2010:0095 vendor-advisory
- oval:org.mitre.oval:def:7357 vdb-entry signature
- 38696 third-party-advisory
- ADV-2010-0129 vdb-entry
- 38184 third-party-advisory