CVE-2021-21900: Use After Free
First published: Fri Nov 19 2021(Updated: )
A code execution vulnerability exists in the dxfRW::processLType() functionality of LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580. A specially-crafted .dxf file can lead to a use-after-free vulnerability. An attacker can provide a malicious file to trigger this vulnerability.
Credit: talos-cna@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/librecad | 2.1.3-1.2+deb10u1 2.1.3-1.3+deb11u1 2.2.0-1 | |
| LibreCad libdxfrw | =2.2.0-rc2-19-ge02f3580 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| Fedoraproject Fedora | =34 | |
| Fedoraproject Fedora | =35 |
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Reference Links
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1351
- https://github.com/LibreCAD/libdxfrw/commit/fcd977cc7f8f6cc7f012e5b72d33cf7d77b3fa69
- https://security-tracker.debian.org/tracker/CVE-2021-21900
- https://lists.debian.org/debian-lts-announce/2021/12/msg00002.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RDI3HCTCACMIC7I4ILB3NRU6DCMADI5H/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZTIAMP7QJDKV4ADDLR4GVVX2TXYLHVOZ/
- https://security.gentoo.org/glsa/202305-26
- https://www.debian.org/security/2022/dsa-5077
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDI3HCTCACMIC7I4ILB3NRU6DCMADI5H/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTIAMP7QJDKV4ADDLR4GVVX2TXYLHVOZ/
Frequently Asked Questions
What is CVE-2021-21900?
CVE-2021-21900 is a code execution vulnerability in the dxfRW::processLType() functionality of LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580.
How severe is CVE-2021-21900?
CVE-2021-21900 has a severity score of 8.8 (high).
How can the CVE-2021-21900 vulnerability be exploited?
The CVE-2021-21900 vulnerability can be exploited by providing a specially-crafted .dxf file to trigger a use-after-free vulnerability in LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580.
- collector/security-tracker-debian
- collector/nvd-index
- agent/author
- agent/severity
- agent/references
- agent/weakness
- agent/description
- agent/type
- agent/event
- agent/softwarecombine
- agent/first-publish-date
- agent/tags
- agent/last-modified-date
- collector/mitre-cve
- source/MITRE
- package-manager/debian
- vendor/librecad
- canonical/librecad libdxfrw
- version/librecad libdxfrw/2.2.0-rc2-19-ge02f3580
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- version/debian debian linux/11.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/34
- version/fedoraproject fedora/35