CVE-2023-39975

kdc/do_tgs_req.c in MIT Kerberos 5 (aka krb5) 1.21 before 1.21.2 has a double free that is reachable if an authenticated user can trigger an authorization-data handling failure. Incorrect data is copied from one ticket to another.

Weakness

The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.

Affected Software

Potential Mitigations

References

• https://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840
• https://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-final
• https://security.netapp.com/advisory/ntap-20230915-0014/
• https://security.netapp.com/advisory/ntap-20240201-0005/
• https://security.netapp.com/advisory/ntap-20240201-0008/
• https://web.mit.edu/kerberos/www/advisories/
• https://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840
• https://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-final
• https://security.netapp.com/advisory/ntap-20230915-0014/
• https://security.netapp.com/advisory/ntap-20240201-0005/
• https://security.netapp.com/advisory/ntap-20240201-0008/
• https://web.mit.edu/kerberos/www/advisories/