CVE-2021-3762: Path Traversal
First published: Fri Sep 03 2021(Updated: )
A directory traversal vulnerability was found in the ClairCore engine of Clair. An attacker can exploit this by supplying a crafted container image which, when scanned by Clair, allows for arbitrary file write on the filesystem, potentially allowing for remote code execution.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/quay/claircore | <0.5.5 | 0.5.5 |
| redhat/quay/claircore | <0.4.8 | 0.4.8 |
| Redhat Clair | >=0.4.6<0.4.8 | |
| Redhat Clair | >=0.5.3<0.5.5 | |
| Redhat Quay | =3.5.6 |
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Reference Links
- https://access.redhat.com/errata/RHSA-2021:3665
- https://access.redhat.com/security/cve/cve-2021-3762
- https://github.com/quay/claircore/pull/478
- https://github.com/quay/clair/pull/1379
- https://github.com/quay/clair/pull/1380
- https://bugzilla.redhat.com/show_bug.cgi?id=2000795
- https://github.com/quay/claircore/commit/691f2023a1720a0579e688b69a2f4bfe1f4b7821
- https://vulmon.com/exploitdetails?qidtp=maillist_oss_security&qid=d19fce9ede06e13dfb5630ece7f14f83
Frequently Asked Questions
What is CVE-2021-3762?
CVE-2021-3762 is a directory traversal vulnerability found in the ClairCore engine of Clair.
How can an attacker exploit CVE-2021-3762?
An attacker can exploit CVE-2021-3762 by supplying a crafted container image which, when scanned by Clair, allows for arbitrary file write on the filesystem, potentially allowing for remote code execution.
What is the severity of CVE-2021-3762?
CVE-2021-3762 has a severity rating of 9.8 (Critical).
Which software versions are affected by CVE-2021-3762?
The affected software versions are Quay/ClairCore 0.5.5 (up to exclusive), Quay/ClairCore 0.4.8 (up to exclusive), Redhat Clair (version 0.4.6 to 0.4.8), Redhat Clair (version 0.5.3 to 0.5.5), and Redhat Quay 3.5.6 (exactly).
How can I fix CVE-2021-3762?
To fix CVE-2021-3762, update the affected software to the recommended versions: Quay/ClairCore 0.5.5 or Quay/ClairCore 0.4.8.
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