CVE-2024-25617

Denial of Service in HTTP Header parser in squid proxy

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version 6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5. There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2

Squid es un proxy de almacenamiento en caché de código abierto para la Web que admite HTTP, HTTPS, FTP y más. Debido a un error de colapso de datos en valor inseguro, Squid puede ser vulnerable a un ataque de denegación de servicio contra el análisis de encabezados HTTP. Este problema permite que un cliente remoto o un servidor remoto realice una Denegación de Servicio al enviar encabezados de gran tamaño en mensajes HTTP. En versiones de Squid anteriores a la 6.5, esto se puede lograr si las configuraciones request_header_max_size o Reply_header_max_size no se modifican con respecto a las predeterminadas. En la versión 6.5 y posteriores de Squid, la configuración predeterminada de estos parámetros es segura. Squid emitirá una advertencia crítica en cache.log si el administrador configura estos parámetros en valores no seguros. Squid no impedirá en este momento que estas configuraciones se cambien a valores inseguros. Se recomienda a los usuarios que actualicen a la versión 6.5. No se conocen workarounds para esta vulnerabilidad. Este problema también se rastrea como SQUID-2024:2

A flaw was found in Squid. This issue may allow a remote client or remote server to trigger a denial of service when sending oversized headers in HTTP messages.

USN-6728-1 fixed vulnerabilities in Squid. The fix for CVE-2023-5824 caused Squid to crash in certain environments on Ubuntu 20.04 LTS. The problematic fix has been reverted pending further investigation. Joshua Rogers discovered that Squid incorrectly handled collapsed forwarding. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. Joshua Rogers discovered that Squid incorrectly handled certain structural elements. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. Joshua Rogers discovered that Squid incorrectly handled Cache Manager error responses. A remote trusted client can possibly use this issue to cause Squid to crash, resulting in a denial of service. Joshua Rogers discovered that Squid incorrectly handled the HTTP Chunked decoder. A remote attacker could possibly use this issue to cause Squid to stop responding, resulting in a denial of service. Joshua Rogers discovered that Squid incorrectly handled HTTP header parsing. A remote trusted client can possibly use this issue to cause Squid to crash, resulting in a denial of service.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-02-08 CVE Reserved
2024-02-14 CVE Published
2025-02-13 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-182: Collapse of Data into Unsafe Value
CWE-400: Uncontrolled Resource Consumption

CAPEC

References (5)

URL	Tag	Source
https://github.com/squid-cache/squid/commit/72a3bbd5e431597c3fdb56d752bc56b010ba3817	X_refsource_misc
https://github.com/squid-cache/squid/security/advisories/GHSA-h5x6-w8mv-xfpr	X_refsource_confirm
https://security.netapp.com/advisory/ntap-20240322-0006

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2024-25617	2024-05-09
https://bugzilla.redhat.com/show_bug.cgi?id=2264309	2024-05-09

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"				< 6.5 Search vendor "Squid-cache" for product "Squid" and version " < 6.5"		en		Affected