An authentication bypass flaw was found in the way krb5s certauth interface before 1.16.1 handled the validation of client certificates. A remote attacker able to communicate with the KDC could potentially use this flaw to impersonate arbitrary principals under rare and erroneous circumstances.
Weakness
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Enterprise_linux | Redhat | 7.0 (including) | 7.0 (including) |
| Enterprise_linux_desktop | Redhat | 7.0 (including) | 7.0 (including) |
| Enterprise_linux_server | Redhat | 7.0 (including) | 7.0 (including) |
| Enterprise_linux_workstation | Redhat | 7.0 (including) | 7.0 (including) |
| Red Hat Enterprise Linux 7 | RedHat | krb5-0:1.15.1-18.el7 | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/114.html
- https://cwe.mitre.org/data/definitions/115.html
- https://cwe.mitre.org/data/definitions/151.html
- https://cwe.mitre.org/data/definitions/194.html
- https://cwe.mitre.org/data/definitions/22.html
- https://cwe.mitre.org/data/definitions/57.html
- https://cwe.mitre.org/data/definitions/593.html
- https://cwe.mitre.org/data/definitions/633.html
- https://cwe.mitre.org/data/definitions/650.html
- https://cwe.mitre.org/data/definitions/94.html
References
- http://www.securityfocus.com/bid/100511
- https://access.redhat.com/errata/RHSA-2018:0666
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562
- https://github.com/krb5/krb5/pull/694
- https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196
- https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2
- https://github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627d
- http://www.securityfocus.com/bid/100511
- https://access.redhat.com/errata/RHSA-2018:0666
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562
- https://github.com/krb5/krb5/pull/694
- https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196
- https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2
- https://github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627d