CVE-2015-5400

Debian Security Advisory 3327-1

Severity Score

9.1

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Squid before 3.5.6 does not properly handle CONNECT method peer responses when configured with cache_peer, which allows remote attackers to bypass intended restrictions and gain access to a backend proxy via a CONNECT request.

Vulnerabilidad en Squid en versiones anteriores a 3.5.6, no maneja adecuadamente las respuestas de pares del método CONNECT cuando se configura con cache_peer, lo que permite a atacantes remotos eludir las restricciones previstas y obtener acceso a un proxy backend a través de una solicitud CONNECT.

Alex Rousskov of The Measurement Factory discovered that Squid3, a fully featured web proxy cache, does not correctly handle CONNECT method peer responses when configured with cache_peer and operating on explicit proxy traffic. This could allow remote clients to gain unrestricted access through a gateway proxy to its backend proxy.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-07-06 CVE Reserved
2015-08-04 CVE Published
2024-08-06 CVE Updated
2024-08-06 First Exploit
2025-04-03 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-264: Permissions, Privileges, and Access Controls

CAPEC

References (15)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2015/07/06/8	Mailing List
http://www.openwall.com/lists/oss-security/2015/07/09/12	Mailing List
http://www.openwall.com/lists/oss-security/2015/07/10/2	Mailing List
http://www.securityfocus.com/bid/75553	Vdb Entry
http://www.securitytracker.com/id/1032873	Vdb Entry

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2015/07/17/14	2024-08-06
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10494.patch	2024-08-06
http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13225.patch	2024-08-06
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13856.patch	2024-08-06

URL	Date	SRC

URL	Date	SRC
http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183598.html	2017-09-22
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html	2017-09-22
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html	2017-09-22
http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html	2017-09-22
http://www.debian.org/security/2015/dsa-3327	2017-09-22
http://www.squid-cache.org/Advisories/SQUID-2015_2.txt	2017-09-22

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				22 Search vendor "Fedoraproject" for product "Fedora" and version "22"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				7.0 Search vendor "Debian" for product "Debian Linux" and version "7.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				<= 3.5.2 Search vendor "Squid-cache" for product "Squid" and version " <= 3.5.2"		-		Affected