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RHEL 8: RHSA-2021-2569-01 Moderate: libxml2 Use-After-Free and Overflow

red hat
Calendar Grey June 29, 2021
Dist Redhat Esm H88
A significant security update for libxml2 has been released for Red Hat Enterprise Linux 8, addressing critical vulnerabilities.
An update for libxml2 is now available for Red Hat Enterprise Linux 8

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The desktop must be restarted (log out, then log back in) for this update to take effect.

Summary

The libxml2 library is a development toolbox providing the implementation of various XML standards.
Security Fix(es):
* libxml2: Use-after-free in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3516)
* libxml2: Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c (CVE-2021-3517)
* libxml2: Use-after-free in xmlXIncludeDoProcess() in xinclude.c (CVE-2021-3518)
* libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode (CVE-2021-3537)
* libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms (CVE-2021-3541)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Topics%20covered

Topics Covered

security advisory moderate buffer overflow Red Hat Enterprise Linux libxml2 use-after-free XML standards

References

https://access.redhat.com/security/cve/CVE-2021-3516 https://access.redhat.com/security/cve/CVE-2021-3517 https://access.redhat.com/security/cve/CVE-2021-3518 https://access.redhat.com/security/cve/CVE-2021-3537 https://access.redhat.com/security/cve/CVE-2021-3541 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux AppStream (v. 8):
aarch64: libxml2-debuginfo-2.9.7-9.el8_4.2.aarch64.rpm libxml2-debugsource-2.9.7-9.el8_4.2.aarch64.rpm libxml2-devel-2.9.7-9.el8_4.2.aarch64.rpm python3-libxml2-debuginfo-2.9.7-9.el8_4.2.aarch64.rpm
ppc64le: libxml2-debuginfo-2.9.7-9.el8_4.2.ppc64le.rpm libxml2-debugsource-2.9.7-9.el8_4.2.ppc64le.rpm libxml2-devel-2.9.7-9.el8_4.2.ppc64le.rpm python3-libxml2-debuginfo-2.9.7-9.el8_4.2.ppc64le.rpm
s390x: libxml2-debuginfo-2.9.7-9.el8_4.2.s390x.rpm libxml2-debugsource-2.9.7-9.el8_4.2.s390x.rpm libxml2-devel-2.9.7-9.el8_4.2.s390x.rpm python3-libxml2-debuginfo-2.9.7-9.el8_4.2.s390x.rpm
x86_64: libxml2-debuginfo-2.9.7-9.el8_4.2.i686.rpm libxml2-debuginfo-2.9.7-9.el8_4.2.x86_64.rpm libxml2-debugsource-2.9.7-9.el8_4.2.i686.rpm libxml2-debugsource-2.9.7-9.el8_4.2.x86_64.rpm libxml2-devel-2.9.7-9.el8_4.2.i686.rpm libxml2-devel-2.9.7-9.el8_4.2.x86_64.rpm python3-libxml2-debuginfo-2.9.7-9.el8_4.2.i686.rpm python3-libxml2-debuginfo-2.9.7-9.el8_4.2.x86_64.rpm
Red Hat Enterprise Linux BaseOS (v. 8):
Source: libxml2-2.9.7-9.el8_4.2.src.rpm
aarch64: libxml2-2.9.7-9.el8_4.2.aarch64.rpm libxml2-debuginfo-2.9.7-9.el8_4.2.aarch64.rpm libxml2-debugsource-2.9.7-9.el8_4.2.aarch64.rpm python3-libxml2-2.9.7-9.el8_4.2.aarch64.rpm

Read the Full Advisory


Advisory ID: RHSA-2021:2569-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2569
Issue date: 2021-06-29

Topic

An update for libxml2 is now available for Red Hat Enterprise Linux 8.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate buffer overflow Red Hat Enterprise Linux libxml2 use-after-free XML standards

Relevant Releases Architectures

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

1950515 - CVE-2021-3541 libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms

1954225 - CVE-2021-3516 libxml2: Use-after-free in xmlEncodeEntitiesInternal() in entities.c

1954232 - CVE-2021-3517 libxml2: Heap-based buffer overflow in xmlEncodeEntitiesInternal() in entities.c

1954242 - CVE-2021-3518 libxml2: Use-after-free in xmlXIncludeDoProcess() in xinclude.c

1956522 - CVE-2021-3537 libxml2: NULL pointer dereference when post-validating mixed content parsed in recovery mode

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