Input validation error in www.privoxy privoxy

1) Input validation error

EUVDB-ID: #VU32346

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-1983

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

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

External links

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

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.