Important: expat security update

Topic

An update for expat is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Expat is a C library for parsing XML documents.

Security Fix(es):

• expat: Malformed 2- and 3-byte UTF-8 sequences can lead to arbitrary code execution (CVE-2022-25235)
• expat: Namespace-separator characters in "xmlns[:prefix]" attribute values can lead to arbitrary code execution (CVE-2022-25236)
• expat: Integer overflow in storeRawNames() (CVE-2022-25315)
• expat: Large number of prefixed XML attributes on a single tag can crash libexpat (CVE-2021-45960)
• expat: Integer overflow in doProlog in xmlparse.c (CVE-2021-46143)
• expat: Integer overflow in addBinding in xmlparse.c (CVE-2022-22822)
• expat: Integer overflow in build_model in xmlparse.c (CVE-2022-22823)
• expat: Integer overflow in defineAttribute in xmlparse.c (CVE-2022-22824)
• expat: Integer overflow in lookup in xmlparse.c (CVE-2022-22825)
• expat: Integer overflow in nextScaffoldPart in xmlparse.c (CVE-2022-22826)
• expat: Integer overflow in storeAtts in xmlparse.c (CVE-2022-22827)
• expat: Integer overflow in function XML_GetBuffer (CVE-2022-23852)

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.

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

After installing the updated packages, applications using the Expat library must be restarted for the update to take effect.

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64

Fixes

• BZ - 2044451 - CVE-2021-45960 expat: Large number of prefixed XML attributes on a single tag can crash libexpat
• BZ - 2044455 - CVE-2021-46143 expat: Integer overflow in doProlog in xmlparse.c
• BZ - 2044457 - CVE-2022-22822 expat: Integer overflow in addBinding in xmlparse.c
• BZ - 2044464 - CVE-2022-22823 expat: Integer overflow in build_model in xmlparse.c
• BZ - 2044467 - CVE-2022-22824 expat: Integer overflow in defineAttribute in xmlparse.c
• BZ - 2044479 - CVE-2022-22825 expat: Integer overflow in lookup in xmlparse.c
• BZ - 2044484 - CVE-2022-22826 expat: Integer overflow in nextScaffoldPart in xmlparse.c
• BZ - 2044488 - CVE-2022-22827 expat: Integer overflow in storeAtts in xmlparse.c
• BZ - 2044613 - CVE-2022-23852 expat: Integer overflow in function XML_GetBuffer
• BZ - 2056363 - CVE-2022-25315 expat: Integer overflow in storeRawNames()
• BZ - 2056366 - CVE-2022-25235 expat: Malformed 2- and 3-byte UTF-8 sequences can lead to arbitrary code execution
• BZ - 2056370 - CVE-2022-25236 expat: Namespace-separator characters in "xmlns[:prefix]" attribute values can lead to arbitrary code execution

CVEs

• CVE-2021-45960
• CVE-2021-46143
• CVE-2022-22822
• CVE-2022-22823
• CVE-2022-22824
• CVE-2022-22825
• CVE-2022-22826
• CVE-2022-22827
• CVE-2022-23852
• CVE-2022-25235
• CVE-2022-25236
• CVE-2022-25315

References

• https://access.redhat.com/security/updates/classification/#important