CVE-2017-7562

An authentication bypass flaw was found in the way krb5's 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.

• CWE-287
• CWE-295
• CWE-287

• http://www.securityfocus.com/bid/100511Third Party Advisory, VDB Entry
• https://access.redhat.com/errata/RHSA-2018:0666Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562Issue Tracking, Patch, Third Party Advisory
• https://github.com/krb5/krb5/pull/694Patch, Third Party Advisory
• https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196Third Party Advisory
• https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2Third Party Advisory
• https://github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627dThird Party Advisory
• http://www.securityfocus.com/bid/100511Third Party Advisory, VDB Entry
• https://access.redhat.com/errata/RHSA-2018:0666Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562Issue Tracking, Patch, Third Party Advisory
• https://github.com/krb5/krb5/pull/694Patch, Third Party Advisory
• https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196Third Party Advisory
• https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2Third Party Advisory
• https://github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627dThird Party Advisory

Published

Jul 26, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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