QID 352392

Date Published: 2021-06-24

QID 352392: Amazon Linux Security Advisory for libxml2: ALAS2-2021-1662

<DIV ID="issue_overview"> gnome project libxml2 v2.9.10 has a global buffer over-read vulnerability in xmlencodeentitiesinternal at libxml2/entities.c.
The issue has been fixed in commit 50f06b3e. (
cve-2020-24977 ) there is a flaw in the xml entity encoding functionality of libxml2.
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 ) a flaw exists in libxml2 which allows for an exponential entity expansion attack which can bypass existing protection mechanisms leading to a potential denial of service. (
cve-2021-3541 ) </DIV>

Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as Critical - 8.6 severity.
  • CVSS V2 rated as High - 7.5 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2021-1662 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352392

    CVE-2021-3541 | CVE-2021-3517 | CVE-2020-24977 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2021-1662 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2021-1662.html
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