// For flags

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

0
*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.

*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
* 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
  • 2024-03-23 EPSS Updated
  • 2024-08-16 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-182: Collapse of Data into Unsafe Value
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
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