CVE-2019-12525

squid: parsing of header Proxy-Authentication leads to memory corruption

Severity Score

9.8

*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 Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.

Se detectó un problema en Squid versiones 3.3.9 hasta 3.5.28 y versiones 4.x hasta 4.7. Cuando Squid está configurado para utilizar la autenticación implícita, analiza el encabezado Proxy-Authorization. Busca ciertos tokens como domain, uri y qop. Squid comprueba si el valor de este token comienza con una comilla y termina con uno. Si es así, realiza un memcpy de su longitud menos 2. Squid nunca comprueba si el valor es sólo una sola comilla (lo que satisfaría sus requisitos), lo que conlleva a un memcpy de su longitud menos 1.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

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

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* 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-787: Out-of-bounds Write

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-4-7f73e9c5d17664b882ed32590e6af310c247f320.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-2019-12525	2020-05-06
https://bugzilla.redhat.com/show_bug.cgi?id=1730535	2020-05-06

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"				>= 3.3.9 <= 3.5.28 Search vendor "Squid-cache" for product "Squid" and version " >= 3.3.9 <= 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
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
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
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				29 Search vendor "Fedoraproject" for product "Fedora" and version "29"		-		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