#VU32346 Input validation error in privoxy - CVE-2016-1983

Vulnerability identifier: #VU32346

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-2016-1983

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
privoxy
Server applications / Web servers

Vendor: privoxy

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The client_host function in parsers.c in Privoxy before 3.0.24 allows remote attackers to cause a denial of service (invalid read and crash) via an empty HTTP Host header.

Mitigation
Install update from vendor's website.

Vulnerable software versions

privoxy: 3.0.21 - 3.0.23

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External links
https://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/parsers.c?r1=1.302&r2=1.303
https://lists.fedoraproject.org/pipermail/package-announce/2016-February/176475.html
https://lists.fedoraproject.org/pipermail/package-announce/2016-February/176492.html
https://www.debian.org/security/2016/dsa-3460
https://www.openwall.com/lists/oss-security/2016/01/21/4
https://www.openwall.com/lists/oss-security/2016/01/22/3
https://www.privoxy.org/announce.txt

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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.