CVE-2019-12529

squid: Out of bounds read in Proxy-Authorization header causes DoS

Severity Score

5.9

*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 Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.

Se detectó un problema en Squid versiones 2.x hasta 2.7.STABLE9, versiones 3.x hasta 3.5.28 y versiones 4.x hasta 4.7. Cuando Squid se configura para utilizar la autenticación básica, el encabezado Proxy-Authorization se analiza por medio de uudecode. uudecode determina cuántos bytes se descodificarán mediante la iteración sobre la entrada y comprobando su tabla. A continuación, la longitud se utiliza para empezar a decodificar la cadena. No hay comprobaciones para asegurarse de que la longitud que calcula no es mayor que el búfer de entrada. Esto conlleva a que la memoria adyacente esta siendo decodificada también. Un atacante no podría recuperar los datos descodificados a menos que el mantenedor de Squid haya configurado la visualización de nombres de usuario en las páginas de error.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-06-02 CVE Reserved
2019-07-11 CVE Published
2024-07-04 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-125: Out-of-bounds Read

CAPEC

References (14)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html	Mailing List
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html	Mailing List
https://seclists.org/bugtraq/2019/Aug/42	Mailing List

URL	Date	SRC

URL	Date	SRC
http://www.squid-cache.org/Versions/v4/changesets/squid-4-dd46b5417809647f561d8a5e0e74c3aacd235258.patch	2023-11-07
https://github.com/squid-cache/squid/commits/v4	2023-11-07

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html	2023-11-07
http://www.squid-cache.org/Versions/v4/changesets	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ	2023-11-07
https://usn.ubuntu.com/4065-1	2023-11-07
https://usn.ubuntu.com/4065-2	2023-11-07
https://www.debian.org/security/2019/dsa-4507	2023-11-07
https://access.redhat.com/security/cve/CVE-2019-12529	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1730528	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 < 2.7 Search vendor "Squid-cache" for product "Squid" and version " >= 2.0 < 2.7"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 3.0 <= 3.5.28 Search vendor "Squid-cache" for product "Squid" and version " >= 3.0 <= 3.5.28"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 4.0 <= 4.7 Search vendor "Squid-cache" for product "Squid" and version " >= 4.0 <= 4.7"		-		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"		stable1		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
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
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
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				29 Search vendor "Fedoraproject" for product "Fedora" and version "29"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.0 Search vendor "Opensuse" for product "Leap" and version "15.0"		-		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
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"		-		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"		esm		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"				19.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.04"		-		Affected