Summary
Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).
Security Fix(es):
* krb5: Kerberos RC4-HMAC-MD5 Checksum Vulnerability Enabling Message Spoofing via MD5 Collisions (CVE-2025-3576)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 7
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | krb5-devel | 1.21.1-8.el9_6 |
| AlmaLinux · 9 | krb5-libs | 1.21.1-8.el9_6 |
| AlmaLinux · 9 | krb5-pkinit | 1.21.1-8.el9_6 |
| AlmaLinux · 9 | krb5-server | 1.21.1-8.el9_6 |
| AlmaLinux · 9 | krb5-server-ldap | 1.21.1-8.el9_6 |
| AlmaLinux · 9 | krb5-workstation | 1.21.1-8.el9_6 |
| AlmaLinux · 9 | libkadm5 | 1.21.1-8.el9_6 |
Vulnerabilities 1
-
Medium 5.9
Krb5: kerberos rc4-hmac-md5 checksum vulnerability enabling message spoofing via md5 collisions
A vulnerability in the MIT Kerberos implementation allows GSSAPI-protected messages using RC4-HMAC-MD5 to be spoofed due to weaknesses in the MD5 checksum design. If RC4 is preferred over stronger encryption types, an attacker could exploit MD5 collisions to …