Debian dla-3398 : curl - security update

high Nessus Plugin ID 174685

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3398 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-3398-1 [email protected] https://www.debian.org/lts/security/ Markus Koschany April 21, 2023 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : curl Version : 7.64.0-4+deb10u6 CVE ID : CVE-2023-27533 CVE-2023-27535 CVE-2023-27536 CVE-2023-27538

Several security vulnerabilities have been found in cURL, an easy-to-use client-side URL transfer library.

CVE-2023-27533

A vulnerability in input validation exists in curl during communication using the TELNET protocol may allow an attacker to pass on maliciously crafted user name and telnet options during server negotiation. The lack of proper input scrubbing allows an attacker to send content or perform option negotiation without the application's intent.
This vulnerability could be exploited if an application allows user input, thereby enabling attackers to execute arbitrary code on the system.

CVE-2023-27535

An authentication bypass vulnerability exists in libcurl in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certain FTP settings such as CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC, and CURLOPT_USE_SSL were not included in the configuration match checks, causing them to match too easily. This could lead to libcurl using the wrong credentials when performing a transfer, potentially allowing unauthorized access to sensitive information.

CVE-2023-27536

An authentication bypass vulnerability exists in libcurl in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed.

CVE-2023-27538

An authentication bypass vulnerability exists in libcurl where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.

For Debian 10 buster, these problems have been fixed in version 7.64.0-4+deb10u6.

We recommend that you upgrade your curl packages.

For the detailed security status of curl please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/curl

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS Attachment:
signature.asc Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the curl packages.

Plugin Details

Severity: High

ID: 174685

File Name: debian_DLA-3398.nasl

Version: 1.3

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 4/25/2023

Updated: 1/22/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

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-2023-27533

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libcurl4, p-cpe:/a:debian:debian_linux:curl, cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:libcurl3-nss, p-cpe:/a:debian:debian_linux:libcurl4-gnutls-dev, p-cpe:/a:debian:debian_linux:libcurl4-doc, p-cpe:/a:debian:debian_linux:libcurl3-gnutls, p-cpe:/a:debian:debian_linux:libcurl4-nss-dev, p-cpe:/a:debian:debian_linux:libcurl4-openssl-dev

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/21/2023

Vulnerability Publication Date: 3/20/2023

Reference Information

CVE: CVE-2023-27533, CVE-2023-27535, CVE-2023-27536, CVE-2023-27538

IAVA: 2023-A-0153-S

Detections

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