Description
MIT Kerberos 5 (aka krb5) 1.3.x, 1.4.x, 1.5.x, 1.6.x, 1.7.x, and 1.8.x through 1.8.3 does not properly determine the acceptability of checksums, which might allow remote attackers to modify user-visible prompt text, modify a response to a Key Distribution Center (KDC), or forge a KRB-SAFE message via certain checksums that (1) are unkeyed or (2) use RC4 keys.
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 | 1.8.3+dfsg-3 | — |
| Debian 13 | krb5 | 1.8.3+dfsg-3 | — |
| Debian 12 | krb5 | 1.8.3+dfsg-3 | — |
| Debian 5.0 | krb5 | 1.6.dfsg.4~beta1-5lenny6 | DSA-2129-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | krb5 +6 | 1.8.2-3.el6_0.3 | RHSA-2010:0925 |
| RHEL 5 | krb5 +4 | 1.6.1-36.el5_5.6 | RHSA-2010:0926 |
| RHEL 4 | krb5 +4 | 1.3.4-62.el4_8.3 | RHSA-2010:0926 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 5
- RHSA-2010:0926 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2010:0925 Red Hat Security Advisory: krb5 security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2129-1 krb5 - checksum verification weakness 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
- WID-SEC-2022-0602 IBM Security Verify Access: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 17, 2024
References
- SUSE-SU-2012:0042 vendor-advisory
- ADV-2010-3094 vdb-entry
- http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
- MDVSA-2010:246 vendor-advisory
- FEDORA-2010-18425 vendor-advisory
- 45118 vdb-entry
- 20111013 VMSA-2011-0012 VMware ESXi and ESX updates to third party libraries and ESX Service Console mailing-list
- http://kb.vmware.com/kb/1035108
- 46397 third-party-advisory
- ADV-2010-3118 vdb-entry
- SSRT100495 vendor-advisory
- oval:org.mitre.oval:def:12121 vdb-entry signature
- ADV-2011-0187 vdb-entry
- MDVSA-2010:245 vendor-advisory
- 69610 vdb-entry
- 20101130 MITKRB5-SA-2010-007 Multiple checksum handling vulnerabilities [CVE-2010-1324 CVE-2010-1323 CVE-2010-4020 CVE-2010-4021] mailing-list
- RHSA-2010:0926 vendor-advisory
- SUSE-SR:2010:023 vendor-advisory
- http://www.vmware.com/security/advisories/VMSA-2011-0007.html
- APPLE-SA-2011-03-21-1 vendor-advisory
- 42420 third-party-advisory
- HPSBUX02623 vendor-advisory
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt
- ADV-2010-3095 vdb-entry
- http://www.vmware.com/security/advisories/VMSA-2011-0012.html
- ADV-2010-3101 vdb-entry
- 42399 third-party-advisory
- SUSE-SU-2012:0010 vendor-advisory
- [security-announce] 20110428 VMSA-2011-0007 VMware ESXi and ESX Denial of Service and third party updates for Likewise components and ESX Service Console mailing-list
- 1024803 vdb-entry
- 20110428 VMSA-2011-0007 VMware ESXi and ESX Denial of Service and third party updates for Likewise components and ESX Service Console mailing-list
- FEDORA-2010-18409 vendor-advisory
- SUSE-SR:2010:024 vendor-advisory
- RHSA-2010:0925 vendor-advisory
- USN-1030-1 vendor-advisory
- 43015 third-party-advisory
- http://support.apple.com/kb/HT4581
- DSA-2129 vendor-advisory
- 42436 third-party-advisory