CVE-2020-15049

squid: Request smuggling and poisoning attack against the HTTP cache

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.

Se detectó un problema en el archivo http/ContentLengthInterpreter.cc en Squid versiones anteriores a 4.12 y versiones 5.x anteriores a 5.0.3. Un ataque de Trafico No Autorizado de Peticiones y Envenenamiento puede tener éxito contra la memoria caché HTTP. El cliente envía una petición HTTP con un encabezado Content-Length que contiene "+\"-" o un prefijo del carácter espacio en blanco de shell poco común en el valor de campo de longitud

A flaw was found in squid. A trusted client is able to perform a request smuggling and poison the HTTP cache contents with crafted HTTP(S) request messages. This attack requires an upstream server to participate in the smuggling and generate the poison response sequence. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-06-25 CVE Reserved
2020-06-30 CVE Published
2024-08-04 CVE Updated
2024-10-24 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CAPEC

References (12)

URL	Tag	Source
https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html	Mailing List
https://security.netapp.com/advisory/ntap-20210312-0001	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC
http://www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1fc7c6eb119a22.patch	2023-11-07
http://www.squid-cache.org/Versions/v5/changesets/squid-5-485c9a7bb1bba88754e07ad0094647ea57a6eb8d.patch	2023-11-07

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3RG5FGSTCAYVIJPJHIY3MRZ7NFT6HDO7	2023-11-07
https://usn.ubuntu.com/4551-1	2023-11-07
https://www.debian.org/security/2020/dsa-4732	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-15049	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1852550	2020-11-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 2.0 <= 2.6 Search vendor "Squid-cache" for product "Squid" and version " >= 2.0 <= 2.6"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 3.1 <= 3.5.28 Search vendor "Squid-cache" for product "Squid" and version " >= 3.1 <= 3.5.28"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 4.0 < 4.12 Search vendor "Squid-cache" for product "Squid" and version " >= 4.0 < 4.12"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 5.0 < 5.0.3 Search vendor "Squid-cache" for product "Squid" and version " >= 5.0 < 5.0.3"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable2		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable3		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable4		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable5		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable6		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable7		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable8		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable9		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				31 Search vendor "Fedoraproject" for product "Fedora" and version "31"		-		Affected