#VU30728 Input validation error in libhtp - CVE-2019-17420

Vulnerability identifier: #VU30728

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-17420

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libhtp
Other software / Other software solutions

Vendor: Open Information Security Foundation

Description

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

In OISF LibHTP before 0.5.31, as used in Suricata 4.1.4 and other products, an HTTP protocol parsing error causes the http_header signature to not alert on a response with a single ending.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libhtp: 0.5.24 - 0.5.30

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External links
https://github.com/OISF/libhtp/compare/0.5.30...0.5.31
https://github.com/OISF/libhtp/pull/213
https://redmine.openinfosecfoundation.org/issues/2969

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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.