Vulnerability Monitor

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CVE-2017-11368

In MIT Kerberos 5 (aka krb5) 1.7 and later, an authenticated attacker can cause a KDC assertion failure by sending invalid S4U2Self or S4U2Proxy requests.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 3 products from fedoraproject, from mit, from mit organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2017, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2017-08-09T18:29:01.450

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 6.5 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

8.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-617

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	fedoraproject	fedora	25	Yes
Operating System	fedoraproject	fedora	26	Yes
Application	mit	kerberos	5-1.13.7	Yes
Application	mit	kerberos_5	1.7	Yes
Application	mit	kerberos_5	1.7.1	Yes
Application	mit	kerberos_5	1.8	Yes
Application	mit	kerberos_5	1.8.1	Yes
Application	mit	kerberos_5	1.8.2	Yes
Application	mit	kerberos_5	1.8.3	Yes
Application	mit	kerberos_5	1.8.4	Yes
Application	mit	kerberos_5	1.8.5	Yes
Application	mit	kerberos_5	1.8.6	Yes
Application	mit	kerberos_5	1.9	Yes
Application	mit	kerberos_5	1.9.1	Yes
Application	mit	kerberos_5	1.9.2	Yes
Application	mit	kerberos_5	1.9.3	Yes
Application	mit	kerberos_5	1.9.4	Yes
Application	mit	kerberos_5	1.10	Yes
Application	mit	kerberos_5	1.10.1	Yes
Application	mit	kerberos_5	1.10.2	Yes
Application	mit	kerberos_5	1.10.3	Yes
Application	mit	kerberos_5	1.10.4	Yes
Application	mit	kerberos_5	1.11	Yes
Application	mit	kerberos_5	1.11.1	Yes
Application	mit	kerberos_5	1.11.2	Yes
Application	mit	kerberos_5	1.11.3	Yes
Application	mit	kerberos_5	1.11.4	Yes
Application	mit	kerberos_5	1.11.5	Yes
Application	mit	kerberos_5	1.12	Yes
Application	mit	kerberos_5	1.12.1	Yes
Application	mit	kerberos_5	1.12.2	Yes
Application	mit	kerberos_5	1.12.3	Yes
Application	mit	kerberos_5	1.13	Yes
Application	mit	kerberos_5	1.13.1	Yes
Application	mit	kerberos_5	1.13.2	Yes
Application	mit	kerberos_5	1.13.3	Yes
Application	mit	kerberos_5	1.13.5	Yes
Application	mit	kerberos_5	1.13.6	Yes
Application	mit	kerberos_5	1.14	Yes
Application	mit	kerberos_5	1.14	Yes
Application	mit	kerberos_5	1.14	Yes
Application	mit	kerberos_5	1.14	Yes
Application	mit	kerberos_5	1.14.1	Yes
Application	mit	kerberos_5	1.14.2	Yes
Application	mit	kerberos_5	1.14.3	Yes
Application	mit	kerberos_5	1.14.4	Yes
Application	mit	kerberos_5	1.14.5	Yes
Application	mit	kerberos_5	1.15	Yes
Application	mit	kerberos_5	1.15.1	Yes
Application	mit	kerberos_5	1.15.1	Yes
Application	mit	kerberos_5	1.15.1	Yes

References

http://www.securityfocus.com/bid/100291 Third Party Advisory, VDB Entry ([email protected])
https://access.redhat.com/errata/RHSA-2018:0666 ([email protected])
https://github.com/krb5/krb5/commit/ffb35baac6981f9e8914f8f3bffd37f284b85970 Patch, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HNWXM6OQU7G23MG7XWIOBRGP43ECLDT/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBUTXMNZWMVJLQ4NDX5OQFPUVCJRLV3W/ ([email protected])
http://www.securityfocus.com/bid/100291 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://access.redhat.com/errata/RHSA-2018:0666 (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/krb5/krb5/commit/ffb35baac6981f9e8914f8f3bffd37f284b85970 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HNWXM6OQU7G23MG7XWIOBRGP43ECLDT/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBUTXMNZWMVJLQ4NDX5OQFPUVCJRLV3W/ (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For fedoraproject's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.