Auth bypass in Mit Kerberos 5
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.032 (87.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.033 · newest: 0.032 · change: -0.001
Affected products
- Mit Kerberos 5
- Mit Krb5 — versions 1.16.1
- Red Hat Enterprise Linux — versions 7.0
- Red Hat Enterprise Linux Desktop — versions 7.0
- Red Hat Enterprise Linux Server — versions 7.0
- Red Hat Enterprise Linux Workstation — versions 7.0
Weakness classification (CWE)
References
- github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2 (Third Party Advisory)
- www.securityfocus.com/bid/100511 (VDB Entry, Third Party Advisory, vdb-entry)
- github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196 (Third Party Advisory)
- github.com/krb5/krb5/pull/694 (Patch, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:0666 (vendor-advisory, Third Party Advisory)
- github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627d (Third Party Advisory)
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2017-7562?
- CVE-2017-7562 is a medium-severity vulnerability in Mit Kerberos 5, classified under Improper Authentication. CVSS score: 6.5/10. Published 2018-07-26.
- How severe is CVE-2017-7562?
- Medium severity. CVSS v3 base score is 6.5 out of 10.