National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2017-7562 Detail

Current 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.

Source:  MITRE
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 6.5 MEDIUM
Vector: AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N (V3.0 legend)
Impact Score: 3.6
Exploitability Score: 2.8


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): High
Availability (A): None

CVSS v2.0 Severity and Metrics:

Base Score: 4.0 MEDIUM
Vector: (AV:N/AC:L/Au:S/C:N/I:P/A:N) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 8.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): Single
Confidentiality (C): None
Integrity (I): Partial
Availability (A): None
Additional Information:
Allows unauthorized modification

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.securityfocus.com/bid/100511 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2018:0666 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7562 Issue Tracking Patch Third Party Advisory
https://github.com/krb5/krb5/pull/694 Patch 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 Third Party Advisory

Technical Details

Vulnerability Type (View All)

  • Improper Authentication (CWE-287)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 2 ( hide )
 cpe:2.3:a:mit:kerberos:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
5-1.16.1


Change History

3 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-7562
NVD Published Date:
07/26/2018
NVD Last Modified:
10/09/2019