EulerOS Virtualization 3.0.2.6 : libxml2 (EulerOS-SA-2021-2884)

high Nessus Plugin ID 156511

Synopsis

The remote EulerOS Virtualization host is missing multiple security updates.

Description

According to the versions of the libxml2 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

- There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability. (CVE-2021-3516)

- There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker who is able to supply a crafted file to be processed by an application linked with the affected functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to application availability, with some potential impact to confidentiality and integrity if an attacker is able to use memory information to further exploit the application. (CVE-2021-3517)

- There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability. (CVE-2021-3518)

- A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability. (CVE-2021-3537)

- A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service. (CVE-2021-3541)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected libxml2 packages.

See Also

http://www.nessus.org/u?43d7f9bc

Plugin Details

Severity: High

ID: 156511

File Name: EulerOS_SA-2021-2884.nasl

Version: 1.3

Type: local

Published: 1/6/2022

Updated: 5/6/2022

Risk Information

CVSS Score Source: CVE-2021-3517

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:huawei:euleros:libxml2, p-cpe:/a:huawei:euleros:libxml2-devel, p-cpe:/a:huawei:euleros:libxml2-python, cpe:/o:huawei:euleros:uvp:3.0.2.6

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

Exploit Ease: No known exploits are available

Patch Publication Date: 12/30/2021

Vulnerability Publication Date: 5/14/2021

Reference Information

CVE: CVE-2021-3516, CVE-2021-3517, CVE-2021-3518, CVE-2021-3537, CVE-2021-3541

IAVA: 2021-A-0487, 2021-A-0482