Vulnerability identifier: #VU8428

Vulnerability risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-10003

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Squid
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Squid-cache.org

Description
The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to incorrect comparison of request headers when Collapsed Forwarding feature is configured. A remote attacker can obtain private and sensitive information about another clients browsing session, including user's credentials.

Successful exploitation of the vulnerability may allow an attacker to obtain potentially sensitive information.

Mitigation
Update to version 3.5.23 or 4.0.17.

Vulnerable software versions

Squid: 3.5 - 3.5.22, 4.0 - 4.0.16

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External links
http://www.squid-cache.org/Advisories/SQUID-2016_10.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.