Description
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 does not properly restrict the use of TGT credentials for armoring TGS requests, which might allow remote authenticated users to impersonate a client by rewriting an inner request, aka a "KrbFastReq forgery issue."
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 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 2
- 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
- ADV-2010-3094 vdb-entry
- MDVSA-2010:246 vendor-advisory
- http://kb.vmware.com/kb/1035108
- ADV-2010-3118 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
- SUSE-SR:2010:023 vendor-advisory
- 69607 vdb-entry
- http://www.vmware.com/security/advisories/VMSA-2011-0007.html
- APPLE-SA-2011-03-21-1 vendor-advisory
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt
- 45122 vdb-entry
- [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
- SUSE-SR:2010:024 vendor-advisory
- USN-1030-1 vendor-advisory
- http://support.apple.com/kb/HT4581