Vulnerability identifier: #VU8901

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-11368

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Kerberos
Server applications / Encryption software

Vendor: MIT

Description
The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The weakness exists due to an assertion failure. A remote attacker can send invalid S4U2Self or S4U2Proxy requests and cause the krb5kdc service to exit on a targeted system.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Update to version 1.14.6 or 1.15.2.

Vulnerable software versions

Kerberos: 5 1.13 - 5-1.15.1

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External links
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8599

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.