#VU31043 Input validation error in Twisted Web - CVE-2019-12387

Vulnerability identifier: #VU31043

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-12387

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Twisted Web
Server applications / Web servers

Vendor: Twisted Matrix Labs

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

In Twisted before 19.2.1, twisted.web did not validate or sanitize URIs or HTTP methods, allowing an attacker to inject invalid characters such as CRLF.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Twisted Web: 19.2.0

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External links
https://lists.opensuse.org/opensuse-security-announce/2019-07/msg00030.html
https://lists.opensuse.org/opensuse-security-announce/2019-07/msg00042.html
https://github.com/twisted/twisted/commit/6c61fc4503ae39ab8ecee52d10f10ee2c371d7e2
https://labs.twistedmatrix.com/2019/06/twisted-1921-released.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2G5RPDQ4BNB336HL6WW5ZJ344MAWNN7N/
https://twistedmatrix.com/pipermail/twisted-python/2019-June/032352.html
https://usn.ubuntu.com/4308-1/
https://usn.ubuntu.com/4308-2/
https://www.oracle.com/security-alerts/cpuapr2020.html

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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.