CVE-2021-45960: Buffer Overflow
First published: Sat Jan 01 2022(Updated: )
In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/expat | <0:2.1.0-14.el7_9 | 0:2.1.0-14.el7_9 |
| redhat/expat | <0:2.2.5-4.el8_5.3 | 0:2.2.5-4.el8_5.3 |
| debian/expat | <=2.2.6-2<=2.2.10-2<=2.2.6-2+deb10u1<=2.4.2-1 | 2.4.3-1 2.2.6-2+deb10u2 2.2.10-2+deb11u1 |
| redhat/expat | <2.4.3 | 2.4.3 |
| ubuntu/expat | <2.2.5-3ubuntu0.4 | 2.2.5-3ubuntu0.4 |
| ubuntu/expat | <2.2.9-1ubuntu0.2 | 2.2.9-1ubuntu0.2 |
| ubuntu/expat | <2.4.1-2ubuntu0.1 | 2.4.1-2ubuntu0.1 |
| ubuntu/expat | <2.4.3-1 | 2.4.3-1 |
| ubuntu/expat | <2.4.3-1 | 2.4.3-1 |
| ubuntu/expat | <2.4.3-1 | 2.4.3-1 |
| ubuntu/expat | <2.4.3-1 | 2.4.3-1 |
| ubuntu/expat | <2.1.0-4ubuntu1.4+ | 2.1.0-4ubuntu1.4+ |
| ubuntu/expat | <2.1.0-7ubuntu0.16.04.5+ | 2.1.0-7ubuntu0.16.04.5+ |
| ubuntu/firefox | <98.0+ | 98.0+ |
| ubuntu/firefox | <98.0+ | 98.0+ |
| ubuntu/firefox | <98.0+ | 98.0+ |
| ubuntu/firefox | <1:1 | 1:1 |
| ubuntu/firefox | <1:1 | 1:1 |
| ubuntu/firefox | <1:1 | 1:1 |
| ubuntu/firefox | <1:1 | 1:1 |
| ubuntu/firefox | <98 | 98 |
| debian/expat | 2.2.6-2+deb10u4 2.2.6-2+deb10u7 2.2.10-2+deb11u5 2.5.0-1 2.6.2-1 | |
| Libexpat Project Libexpat | <2.4.3 | |
| Tenable Nessus | <8.15.3 | |
| Tenable Nessus | >=10.0.0<10.1.1 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| Siemens SINEMA Remote Connect Server | <3.1 | |
| Netapp Active Iq Unified Manager Vmware Vsphere | ||
| Netapp Hci Baseboard Management Controller | =h610c | |
| Netapp Hci Baseboard Management Controller | =h610s | |
| Netapp Hci Baseboard Management Controller | =h615c | |
| NetApp OnCommand Workflow Automation | ||
| Netapp Solidfire \& Hci Management Node |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-45960 https://nvd.nist.gov/vuln/detail/CVE-2021-45960 https://github.com/libexpat/libexpat/issues/531
- https://bugzilla.redhat.com/show_bug.cgi?id=2044451
- https://access.redhat.com/errata/RHSA-2022:1069
- https://access.redhat.com/errata/RHSA-2022:0951
- https://access.redhat.com/errata/RHSA-2022:7144
- https://access.redhat.com/security/cve/cve-2021-45960
- https://github.com/libexpat/libexpat/issues/531
- https://security-tracker.debian.org/tracker/CVE-2021-45960
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45960
- https://security-tracker.debian.org/tracker/CVE-2021-46143
- https://security-tracker.debian.org/tracker/CVE-2022-22822
- https://security-tracker.debian.org/tracker/CVE-2022-22823
- https://security-tracker.debian.org/tracker/CVE-2022-22824
- https://security-tracker.debian.org/tracker/CVE-2022-22825
- https://security-tracker.debian.org/tracker/CVE-2022-22826
- https://security-tracker.debian.org/tracker/CVE-2022-22827
- https://security-tracker.debian.org/tracker/CVE-2022-23852
- https://security-tracker.debian.org/tracker/CVE-2022-23990
- https://github.com/libexpat/libexpat/commit/0adcb34c49bee5b19bd29b16a578c510c23597ea
- https://tracker.debian.org/news/1306825/accepted-expat-2210-2deb11u2-source-into-proposed-updates-stable-new-proposed-updates/
- https://tracker.debian.org/news/1306839/accepted-expat-226-2deb10u3-source-into-oldstable-proposed-updates-oldstable-new-oldstable-proposed-updates/
- http://snapshot.debian.org/package/expat/2.2.10-2%2Bdeb11u2/
- http://snapshot.debian.org/package/expat/2.2.6-2%2Bdeb10u3/
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1002994
- https://bugzilla.mozilla.org/show_bug.cgi?id=1217609
- https://github.com/libexpat/libexpat/pull/534
- http://www.openwall.com/lists/oss-security/2022/01/17/3
- https://security.netapp.com/advisory/ntap-20220121-0004/
- https://www.tenable.com/security/tns-2022-05
- https://www.debian.org/security/2022/dsa-5073
- https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
- https://security.gentoo.org/glsa/202209-24
- https://launchpad.net/bugs/cve/CVE-2021-45960
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2044452
- https://access.redhat.com/errata/RHSA-2022:7143
- https://github.com/libexpat/libexpat/pull/534/commits/0adcb34c49bee5b19bd29b16a578c510c23597ea
- https://ubuntu.com/security/notices/USN-5288-1
- https://www.cve.org/CVERecord?id=CVE-2021-45960
- https://nvd.nist.gov/vuln/detail/CVE-2021-45960
- https://hg.mozilla.org/releases/mozilla-release/rev/1e64d3320bbc46520fecfd57e288278a92fdd6ae
- https://ubuntu.com/security/CVE-2021-45960
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2021-45960?
CVE-2021-45960 is a vulnerability in Expat (libexpat) which can cause process interruption and unexpected termination due to buffer overrun when processing a large number of prefixed XML attributes on a single tag.
What is the severity of CVE-2021-45960?
The severity of CVE-2021-45960 is critical with a CVSS score of 8.8.
Which software is affected by CVE-2021-45960?
Expat (libexpat) versions prior to 2.4.3 are affected by CVE-2021-45960.
How can I fix CVE-2021-45960?
To fix CVE-2021-45960, update Expat (libexpat) to version 2.4.3 or later.
Are there any references for CVE-2021-45960?
Yes, you can find references for CVE-2021-45960 at the following links: [Link 1](https://github.com/libexpat/libexpat/issues/531), [Link 2](https://github.com/libexpat/libexpat/pull/534), [Link 3](https://bugzilla.mozilla.org/show_bug.cgi?id=1217609).
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