Huawei EulerOS: Security Advisory for libxml2 (EulerOS-SA-2021-2249)

Published: 2021-08-09 10:10:24
CVE Author: NIST National Vulnerability Database

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

severity_vector=CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

severity_origin=NVD

severity_date=2021-07-06 06:15:00 +0000 (Tue, 06 Jul 2021)

Summary:
The remote host is missing an update for the Huawei EulerOS 'libxml2' Linux Distribution Package(s) announced via the EulerOS-SA-2021-2249 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
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) This library allows to manipulate XML files. It includes supportto read, modify and write XML and HTML files. There is DTDs supportthis includes parsing and validation even with complex DtDs, eitherat parse time or later once the document has been modified. The outputcan be a simple SAX stream or an(CVE-2021-3541)

Affected Versions:
'libxml2' Linux Distribution Package(s) on Huawei EulerOS V2.0SP9(x86_64).

Recommendations:
Please install the updated Linux Distribution Package(s).

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2021-3516
https://nvd.nist.gov/vuln/detail/CVE-2021-3517
https://nvd.nist.gov/vuln/detail/CVE-2021-3518
https://nvd.nist.gov/vuln/detail/CVE-2021-3537
https://nvd.nist.gov/vuln/detail/CVE-2021-3541

References:


https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2021-2249

Severity
High
CVSS Score
7.5
Published
2021-08-09
Modified
2021-08-10
Category
Huawei EulerOS Local Security Checks

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