// For flags

CVE-2020-8449

squid: Improper input validation issues in HTTP Request processing

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.

Se detectó un problema en Squid versiones anteriores a 4.10. Debido a una comprobación de entrada incorrecta, puede interpretar las peticiones HTTP diseñadas de manera no prevista para acceder a recursos del servidor prohibidos por parte de los filtros de seguridad anteriores.

A flaw was found in squid. Due to incorrect input validation, squid can interpret crafted HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.

Jeriko One discovered that Squid incorrectly handled memory when connected to an FTP server. A remote attacker could possibly use this issue to obtain sensitive information from Squid memory. Regis Leroy discovered that Squid incorrectly handled certain HTTP requests. A remote attacker could possibly use this issue to access server resources prohibited by earlier security filters. Guido Vranken discovered that Squid incorrectly handled certain buffer operations when acting as a reverse proxy. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-01-30 CVE Reserved
  • 2020-02-04 CVE Published
  • 2024-08-04 CVE Updated
  • 2025-05-06 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
  • CWE-668: Exposure of Resource to Wrong Sphere
CAPEC
References (17)
URL Tag Source
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing List
https://security.netapp.com/advisory/ntap-20210304-0002 Third Party Advisory
URL Date SRC
URL Date SRC
http://www.squid-cache.org/Advisories/SQUID-2020_1.txt 2023-11-07
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2020_1.patch 2023-11-07
http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-8e657e835965c3a011375feaa0359921c5b3e2dd.patch 2023-11-07
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_1.patch 2023-11-07
http://www.squid-cache.org/Versions/v4/changesets/squid-4-b3a0719affab099c684f1cd62b79ab02816fa962.patch 2023-11-07
http://www.squid-cache.org/Versions/v4/changesets/squid-4-d8e4715992d0e530871519549add5519cbac0598.patch 2023-11-07
URL Date SRC
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.html 2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.html 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G6W2IQ7QV2OGREFFUBNVZIDD3RJBDE4R 2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TSU6SPANL27AGK5PCGBJOKG4LUWA555J 2023-11-07
https://security.gentoo.org/glsa/202003-34 2023-11-07
https://usn.ubuntu.com/4289-1 2023-11-07
https://www.debian.org/security/2020/dsa-4682 2023-11-07
https://access.redhat.com/security/cve/CVE-2020-8449 2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1798540 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"
 < 4.10
Search vendor "Squid-cache" for product "Squid" and version " < 4.10"
-
Affected
Debian
Search vendor "Debian"
 Debian Linux
Search vendor "Debian" for product "Debian Linux"
 9.0
Search vendor "Debian" for product "Debian Linux" and version "9.0"
-
Affected
Debian
Search vendor "Debian"
 Debian Linux
Search vendor "Debian" for product "Debian Linux"
 10.0
Search vendor "Debian" for product "Debian Linux" and version "10.0"
-
Affected
Canonical
Search vendor "Canonical"
 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
 16.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"
lts
Affected
Canonical
Search vendor "Canonical"
 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
 18.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"
lts
Affected
Canonical
Search vendor "Canonical"
 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
 19.10
Search vendor "Canonical" for product "Ubuntu Linux" and version "19.10"
-
Affected
Opensuse
Search vendor "Opensuse"
 Leap
Search vendor "Opensuse" for product "Leap"
 15.1
Search vendor "Opensuse" for product "Leap" and version "15.1"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 30
Search vendor "Fedoraproject" for product "Fedora" and version "30"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 31
Search vendor "Fedoraproject" for product "Fedora" and version "31"
-
Affected