Input validation error in Twisted Web

1) Input validation error

EUVDB-ID: #VU31043

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12387

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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

External links

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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