Slackware Linux 14.0 / 14.1 / 14.2 / 15.0 / current curl Multiple Vulnerabilities (SSA:2023-284-01)

critical Nessus Plugin ID 182876

Synopsis

The remote Slackware Linux host is missing a security update to curl.

Description

The version of curl installed on the remote host is prior to 8.4.0. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2023-284-01 advisory.

- CVE-2023-38545 is a heap-based buffer overflow vulnerability in the SOCKS5 proxy handshake in libcurl and curl. When curl is given a hostname to pass along to a SOCKS5 proxy that is greater than 255 bytes in length, it will switch to local name resolution in order to resolve the address before passing it on to the SOCKS5 proxy. However, due to a bug introduced in 2020, this local name resolution could fail due to a slow SOCKS5 handshake, causing curl to pass on the hostname greater than 255 bytes in length into the target buffer, leading to a heap overflow. The advisory for CVE-2023-38545 gives an example exploitation scenario of a malicious HTTPS server redirecting to a specially crafted URL. While it might seem that an attacker would need to influence the slowness of the SOCKS5 handshake, the advisory states that server latency is likely slow enough to trigger this bug. (CVE-2023-38545)

- Please review the referenced CVE identifiers for details. Note that the risk of remote code execution is limited to SOCKS usage. (CVE-2023-38546)

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

Solution

Upgrade the affected curl package.

See Also

http://www.nessus.org/u?fb45b2b3

Plugin Details

Severity: Critical

ID: 182876

File Name: Slackware_SSA_2023-284-01.nasl

Version: 1.6

Type: local

Published: 10/11/2023

Updated: 12/8/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.0

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:slackware:slackware_linux:14.2, cpe:/o:slackware:slackware_linux:15.0, cpe:/o:slackware:slackware_linux:14.1, p-cpe:/a:slackware:slackware_linux:curl, cpe:/o:slackware:slackware_linux, cpe:/o:slackware:slackware_linux:14.0

Required KB Items: Host/local_checks_enabled, Host/Slackware/release, Host/Slackware/packages

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/10/2023

Vulnerability Publication Date: 10/11/2023

Reference Information

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

IAVA: 2023-A-0531-S