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Security Advisory

EXPAT - 2022 CVES - GROUP 1
Published: August 26, 2022
Last Update: August 26, 2022
Summary

In January - February 2022, a number of vulnerabilities were disclosed [1,2,3] for the expat (libexpat) library where a remote attacker providing specially crafted XML content could potential result in Denial-of-Service (DoS) impacts or arbitrary code execution on ACOS systems. These vulnerabilities are addressed in this document. They may affect ACOS management plane services, including external health monitors processing XML content, and data plane services involving the use of aFlex to process XML content.

Item Score
# Vulnerability ID Source Score Summary
0 CVE-2021-45960 CVSSv3 8.8 High expat: Large number of prefixed XML attributes on a single tag can crash libexpat [4]
1 CVE-2021-46143 CVSSv3 7.8 High expat: Integer overflow in doProlog in xmlparse.c [5]
2 CVE-2022-22822 CVSSv3 9.8 Critical expat: Integer overflow in addBinding in xmlparse.c [6]
3 CVE-2022-22823 CVSSv3 9.8 Critical expat: Integer overflow in build_model in xmlparse.c [7]
4 CVE-2022-22824 CVSSv3 9.8 Critical expat: Integer overflow in defineAttribute in xmlparse.c [8]
5 CVE-2022-22825 CVSSv3 8.8 High expat: Integer overflow in lookup in xmlparse.c [9]
6 CVE-2022-22826 CVSSv3 8.8 High expat: Integer overflow in nextScaffoldPart in xmlparse.c [10]
7 CVE-2022-22827 CVSSv3 8.8 High expat: Integer overflow in storeAtts in xmlparse.c [11]
8 CVE-2022-23852 CVSSv3 9.8 Critical expat: Integer overflow in function XML_GetBuffer [12]
9 CVE-2022-25235 CVSSv3 9.8 Critical expat: Malformed 2- and 3-byte UTF-8 sequences can lead to arbitrary code execution [13]
10 CVE-2022-25236 CVSSv3 9.8 Critical expat: Namespace-separator characters in "xmlns[:prefix]" attribute values can lead to arbitrary code execution [14]
11 CVE-2022-25315 CVSSv3 9.8 Critical expat: Integer overflow in storeRawNames() [15]
Affected Releases

The table below indicates releases of ACOS exposed to this vulnerability and ACOS releases that address them. ACOS release families not indicated below are unaffected by these vulnerabilities.

Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.

Releases Affected Releases Resolved or Unaffected
5.0.0 – 5.2.1-P5 5.2.1-P6
5.0.1 TPS – 5.0.2-P1 TPS 5.0.2-P2-TPS
4.1.4-GR1 – 4.1.4-GR1-P10 4.1.4-GR1-P11
3.2.3-P1 – 3.2.5-P6 5.0.2-P2 TPS
Workarounds and Mitigations

None

Software Updates

Software updates that address these vulnerabilities are or will be published at the following URL:
https://support.a10networks.com/

Vulnerability Details
Vulnerability ID Vulnerability Description
Acknowledgements

None

Modification History
Revision Date Description
1.0 August 26, 2022

Initial Publication


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