#VU13986 Infinite loop in Apache Tomcat - CVE-2018-1336

Vulnerability identifier: #VU13986

Vulnerability risk: Medium

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:Green]

CVE-ID: CVE-2018-1336

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Tomcat
Server applications / Web servers

Vendor: Apache Foundation

Description

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

The vulnerability exists due to improper handing of overflow in the UTF-8 decoder with supplementary characters. A remote attacker can send trigger an infinite loop in the decoder and cause the service to crash.

Mitigation
The vulnerability is addressed in the versions 7.0.88, 8.0.52, 8.5.31, 9.0.8.

Vulnerable software versions

Apache Tomcat: 7.0.28 - 7.0.87, 8.0.0 RC1 - 8.0.51, 8.5.0 - 8.5.30, 9.0.0-M1 - 9.0.7

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External links
https://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.88
https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.0.52
https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.31
https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.8

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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.