#VU14268 Infinite loop in Keycloak - CVE-2017-2646

Vulnerability identifier: #VU14268

Vulnerability risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-2646

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Keycloak
Server applications / Directory software, identity management

Vendor: Keycloak

Description

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

The vulnerability existsdue to improper processing of logout requests that contain an extension element. A remote attacker can send a specially crafted logout request that submits malicious input, make the SAMLSloRequestParser.parse() method end in an infinite loop and cause the service to crash.

Mitigation
Update to version 2.5.5.

Vulnerable software versions

Keycloak: 2.0.0 - 2.5.4

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External links
https://access.redhat.com/security/cve/cve-2017-2646

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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.