Input validation error in Squid-cache Squid

1) Input validation error

EUVDB-ID: #VU40340

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-2390

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 FwdState::connectedToPeer method in FwdState.cc in Squid before 3.5.14 and 4.0.x before 4.0.6 does not properly handle SSL handshake errors when built with the --with-openssl option, which allows remote attackers to cause a denial of service (application crash) via a plaintext HTTP message.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Squid: 4.0.4 - 4.0.5

External links

http://bugs.squid-cache.org/show_bug.cgi?id=4437
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html
http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000037.html
http://lists.squid-cache.org/pipermail/squid-announce/2016-February/000038.html
http://www.securitytracker.com/id/1035045
http://www.squid-cache.org/Advisories/SQUID-2016_1.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.