Amazon Linux 2 : curl (ALAS-2023-2287)

critical Nessus Plugin ID 182948

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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 8.3.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2023-2287 advisory.

An issue was found in curl that can cause a buffer overflow in its SOCKS5 proxy communications code.

When curl is using a SOCKS5 proxy and it needs to resolve a hostname to an IP address, its default behavior is to pass the hostname to the proxy and allow it to perform the resolution. In cases where the hostname is greater than 255 characters in length, curl will instead attempt to perform the resolution locally and then pass the resolved IP to the proxy for its use. Due to an issue in the curl source code, the logic that determines whether curl should resolve the name locally or pass it to the proxy for resolution could make an incorrect decision when a slow SOCKS5 handshake occurs. If this occurs, curl may inadvertently copy an excessively long host name, rather than the resolved address, into the target buffer being prepared for transmission to the proxy, resulting in a buffer overflow. (CVE-2023-38545)

An issue was found in libcurl which allows cookies to be inserted into a running program if specific conditions are met. The libcurl provided function, curl_easy_duphandle(), is used to duplicate the easy_handle associated with a transfer. If a duplicated transfer's easy_handle has cookies enabled when it is duplicated, the cookie-enabled state is cloned but the actual cookies are not. If the source easy_handle didn't read cookies from disk, the cloned easy_handle will attempt to read cookies from a file named 'none' in the local directory, potentially allowing arbitrary cookies to be loaded. (CVE-2023-38546)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

Solution

Run 'yum update curl' to update your system.

Plugin Details

Severity: Critical

ID: 182948

File Name: al2_ALAS-2023-2287.nasl

Version: 1.8

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/12/2023

Updated: 12/17/2024

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

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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

CVSS Score Source: CVE-2023-38545

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, 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

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: 10/10/2023

Vulnerability Publication Date: 10/10/2023

Reference Information

CVE: CVE-2023-38545, CVE-2023-38546

IAVA: 2023-A-0531-S

Detections

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