Amazon Linux 2 : squid (ALAS-2020-1486)

high Nessus Plugin ID 140199

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1486 advisory.

- This vulnerability allows remote attackers to deny service on vulnerable installations of The Squid Software Foundation Squid 3.5.27-20180318. Authentication is not required to exploit this vulnerability.
The specific flaw exists within ClientRequestContext::sslBumpAccessCheck(). A crafted request can trigger the dereference of a null pointer. An attacker can leverage this vulnerability to create a denial-of- service condition to users of the system. Was ZDI-CAN-6088. (CVE-2018-1172)

- An issue was discovered in Squid before 4.10. It allows a crafted FTP server to trigger disclosure of sensitive information from heap memory, such as information associated with other users' sessions or non- Squid processes. (CVE-2019-12528)

- An issue was discovered in Squid 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating memory areas to target for remote code execution attacks.
(CVE-2019-18679)

- An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy. (CVE-2020-8450)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update squid' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2020-1486.html

https://access.redhat.com/security/cve/CVE-2018-1172

https://access.redhat.com/security/cve/CVE-2019-12528

https://access.redhat.com/security/cve/CVE-2019-18679

https://access.redhat.com/security/cve/CVE-2020-8450

Plugin Details

Severity: High

ID: 140199

File Name: al2_ALAS-2020-1486.nasl

Version: 1.2

Type: local

Agent: unix

Published: 9/2/2020

Updated: 5/12/2022

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2020-8450

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: E:U/RL:O/RC:C

CVSS Score Source: CVE-2019-18679

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:squid, p-cpe:/a:amazon:linux:squid-debuginfo, p-cpe:/a:amazon:linux:squid-migration-script, p-cpe:/a:amazon:linux:squid-sysvinit, cpe:/o:amazon:linux:2

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 9/1/2020

Vulnerability Publication Date: 5/16/2018

Reference Information

CVE: CVE-2018-1172, CVE-2019-12528, CVE-2019-18679, CVE-2020-8450

ALAS: 2020-1486