CVE-2017-7562

MEDIUM

Krb5 <1.16.1 - Auth Bypass

Title source: llm

Description

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.

References (7)

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/100511

[Third Party Advisory] https://access.redhat.com/errata/RHSA-2018:0666

[Issue Tracking, Patch, Third Party Advisory] https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562

[Patch, Third Party Advisory] https://github.com/krb5/krb5/pull/694

[Third Party Advisory] https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196

[Third Party Advisory] https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2

[Third Party Advisory] https://github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627d

Scores

CVSS v3 6.5

EPSS 0.0043

EPSS Percentile 62.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Classification

CWE

CWE-295 CWE-287

Status published

Affected Products (5)

redhat/enterprise_linux

redhat/enterprise_linux_desktop

redhat/enterprise_linux_server

redhat/enterprise_linux_workstation

mit/kerberos_5 < 1.16.1

Timeline

Published Jul 26, 2018

Tracked Since Feb 18, 2026