Description
An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a "u4" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.
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 | No fix yet | — |
| Debian 13 | krb5 | No fix yet | — |
| Debian 12 | krb5 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | krb5 | No fix yet | — |
| Ubuntu 20.04 LTS | krb5 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | krb5 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | krb5 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | krb5 | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | krb5 | 1.15.3-r0 | — |
| Alpine v3.23 | krb5 | 1.15.3-r0 | — |
| Alpine v3.22 | krb5 | 1.15.3-r0 | — |
| Alpine v3.21 | krb5 | 1.15.3-r0 | — |
| Alpine v3.20 | krb5 | 1.15.3-r0 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | krb5 | 1.15.3-r0 | — |
| Alpine v3.18 | krb5 | 1.15.3-r0 | — |
| Alpine v3.17 | krb5 | 1.15.3-r0 | — |
| Alpine v3.16 | krb5 | 1.15.3-r0 | — |
| Alpine v3.15 | krb5 | 1.15.3-r0 | — |
| Alpine v3.14 | krb5 | 1.15.3-r0 | — |
| Alpine v3.13 | krb5 | 1.15.3-r0 | — |
| Alpine v3.12 | krb5 | 1.15.3-r0 | — |
| Alpine v3.11 | krb5 | 1.15.3-r0 | — |
| Alpine v3.10 | krb5 | 1.15.3-r0 | — |
| Alpine v3.9 | krb5 | 1.15.3-r0 | — |
| Alpine v3.8 | krb5 | 1.15.3-r0 | — |
| Alpine v3.7 | krb5 | 1.15.3-r0 | — |