Amazon Linux 2 : curl (ALAS-2021-1693)

high Nessus Plugin ID 152237

Synopsis

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

Description

The version of curl installed on the remote host is prior to 7.76.1-4. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1693 advisory.

- Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data. (CVE-2020-8231)

- A malicious server can use the FTP PASV response to trick curl 7.73.0 and earlier into connecting back to a given IP address and port, and this way potentially make curl extract information about services that are otherwise private and not disclosed, for example doing port scanning and service banner extractions.
(CVE-2020-8284)

- curl 7.21.0 to and including 7.73.0 is vulnerable to uncontrolled recursion due to a stack overflow issue in FTP wildcard match parsing. (CVE-2020-8285)

- curl 7.41.0 through 7.73.0 is vulnerable to an improper check for certificate revocation due to insufficient verification of the OCSP response. (CVE-2020-8286)

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 curl' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2021-1693.html

https://access.redhat.com/security/cve/CVE-2020-8231

https://access.redhat.com/security/cve/CVE-2020-8284

https://access.redhat.com/security/cve/CVE-2020-8285

https://access.redhat.com/security/cve/CVE-2020-8286

Plugin Details

Severity: High

ID: 152237

File Name: al2_ALAS-2021-1693.nasl

Version: 1.5

Type: local

Agent: unix

Published: 8/6/2021

Updated: 12/6/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.1

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2020-8286

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 7

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

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:curl, p-cpe:/a:amazon:linux:curl-debuginfo, p-cpe:/a:amazon:linux:libcurl, p-cpe:/a:amazon:linux:libcurl-devel, cpe:/o:amazon:linux:2

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/4/2021

Vulnerability Publication Date: 8/19/2020

Reference Information

CVE: CVE-2020-8231, CVE-2020-8284, CVE-2020-8285, CVE-2020-8286

ALAS: 2021-1693

IAVA: 2020-A-0389-S, 2020-A-0581, 2021-A-0202-S