SUSE SLES15 Security Update : curl (SUSE-SU-2023:2227-1)

medium Nessus Plugin ID 176046

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Synopsis

The remote SUSE host is missing one or more security updates.

Description

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:2227-1 advisory.

- A denial of service vulnerability exists in curl <v8.1.0 in the way libcurl provides several different backends for resolving host names, selected at build time. If it is built to use the synchronous resolver, it allows name resolves to time-out slow operations using `alarm()` and `siglongjmp()`. When doing this, libcurl used a global buffer that was not mutex protected and a multi-threaded application might therefore crash or otherwise misbehave. (CVE-2023-28320)

- 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)

- An information disclosure vulnerability exists in curl <v8.1.0 when doing HTTP(S) transfers, libcurl might erroneously use the read callback (`CURLOPT_READFUNCTION`) to ask for data to send, even when the `CURLOPT_POSTFIELDS` option has been set, if the same handle previously wasused to issue a `PUT` request which used that callback. This flaw may surprise the application and cause it to misbehave and either send off the wrong data or use memory after free or similar in the second transfer. The problem exists in the logic for a reused handle when it is (expected to be) changed from a PUT to a POST. (CVE-2023-28322)

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

Solution

Update the affected curl, libcurl-devel, libcurl4 and / or libcurl4-32bit packages.

See Also

https://bugzilla.suse.com/1211231

https://bugzilla.suse.com/1211232

https://bugzilla.suse.com/1211233

https://bugzilla.suse.com/1211339

https://lists.suse.com/pipermail/sle-updates/2023-May/029438.html

https://www.suse.com/security/cve/CVE-2023-28320

https://www.suse.com/security/cve/CVE-2023-28321

https://www.suse.com/security/cve/CVE-2023-28322

Plugin Details

Severity: Medium

ID: 176046

File Name: suse_SU-2023-2227-1.nasl

Version: 1.7

Type: local

Agent: unix

Published: 5/18/2023

Updated: 7/20/2023

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, 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:novell:suse_linux:curl, p-cpe:/a:novell:suse_linux:libcurl-devel, p-cpe:/a:novell:suse_linux:libcurl4, p-cpe:/a:novell:suse_linux:libcurl4-32bit, cpe:/o:novell:suse_linux:15

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/17/2023

Vulnerability Publication Date: 5/18/2023

Reference Information

CVE: CVE-2023-28320, CVE-2023-28321, CVE-2023-28322

IAVA: 2023-A-0259-S

SuSE: SUSE-SU-2023:2227-1