Vulnerability Details : 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 category: BypassGain privilege
Products affected by CVE-2017-7562
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
- cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-7562
0.27%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 50 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-7562
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.0
|
MEDIUM | AV:N/AC:L/Au:S/C:N/I:P/A:N |
8.0
|
2.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
2.8
|
3.6
|
Red Hat, Inc. | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
2.8
|
3.6
|
NIST |
CWE ids for CVE-2017-7562
-
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.Assigned by:
- nvd@nist.gov (Secondary)
- secalert@redhat.com (Primary)
-
The product does not validate, or incorrectly validates, a certificate.Assigned by: secalert@redhat.com (Primary)
References for CVE-2017-7562
-
https://github.com/krb5/krb5/pull/694/commits/b7af544e50a4d8291524f590e20dd44430bf627d
Commit range not found · Pull Request #694 · krb5/krb5 · GitHubThird Party Advisory
-
https://github.com/krb5/krb5/pull/694/commits/50fe4074f188c2d4da0c421e96553acea8378db2
Commit range not found · Pull Request #694 · krb5/krb5 · GitHubThird Party Advisory
-
https://github.com/krb5/krb5/pull/694
Make certauth eku module restrictive-only by greghudson · Pull Request #694 · krb5/krb5 · GitHubPatch;Third Party Advisory
-
https://github.com/krb5/krb5/pull/694/commits/1de6ca2f2eb1fdbab51f1549a25a6903aefcc196
Commit range not found · Pull Request #694 · krb5/krb5 · GitHubThird Party Advisory
-
https://access.redhat.com/errata/RHSA-2018:0666
RHSA-2018:0666 - Security Advisory - Red Hat Customer PortalThird Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562
1485510 – (CVE-2017-7562) CVE-2017-7562 krb5: Authentication bypass by improper validation of certificate EKU and SANIssue Tracking;Patch;Third Party Advisory
-
http://www.securityfocus.com/bid/100511
MIT krb5 CVE-2017-7562 Authentication Bypass VulnerabilityThird Party Advisory;VDB Entry
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