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Debian DLA-3613-1 : curl - LTS security update

medium Nessus Plugin ID 182933

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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-3613 advisory.

 - An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wildcard patterns when listed as Subject Alternative Name in TLS server certificates. curl can be built to use its own name matching function for TLS rather than one provided by a TLS library. This private wildcard matching function would match IDN (International Domain Name) hosts incorrectly and could as a result accept patterns that otherwise should mismatch. IDN hostnames are converted to puny code before used for certificate checks. Puny coded names always start with `xn--` and should not be allowed to pattern match, but the wildcard check in curl could still check for `x*`, which would match even though the IDN name most likely contained nothing even resembling an `x`. (CVE-2023-28321)

 - CVE-2023-38546 is a cookie injection vulnerability in the curl_easy_duphandle(), a function in libcurl that duplicates easy handles. When duplicating an easy handle, if cookies are enabled, the duplicated easy handle will not duplicate the cookies themselves, but would instead set the filename to none.' Therefore, when the duplicated easy handle is subsequently used, if a source was not set for the cookies, libcurl would attempt to load them from the file named none' on the disk. This vulnerability is rated low, as the various conditions required for exploitation are unlikely. (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 curl packages.

For Debian 10 buster, these problems have been fixed in version 7.64.0-4+deb10u7.

See Also

https://security-tracker.debian.org/tracker/source-package/curl

https://www.debian.org/lts/security/2023/dla-3613

https://security-tracker.debian.org/tracker/CVE-2023-28321

https://security-tracker.debian.org/tracker/CVE-2023-38546

https://packages.debian.org/source/buster/curl

Plugin Details

Severity: Medium

ID: 182933

File Name: debian_DLA-3613.nasl

Version: 1.4

Type: local

Agent: unix

Published: 10/11/2023

Updated: 12/8/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.2

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

CVSS Score Source: CVE-2023-28321

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.3

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

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: 10/11/2023

Vulnerability Publication Date: 5/19/2023

Reference Information

CVE: CVE-2023-28321, CVE-2023-38546

IAVA: 2023-A-0259-S, 2023-A-0531-S