CVE-2021-33640: Use After Free
First published: Mon Dec 19 2022(Updated: )
After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the released memory is used (use-after-free).
Credit: securities@openeuler.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Huawei Openeuler | =20.03-sp1 | |
| Huawei Openeuler | =20.03-sp2 | |
| Huawei Openeuler | =22.03 | |
| Fedoraproject Fedora | =36 | |
| Fedoraproject Fedora | =37 |
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Reference Links
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4S4PJRCJLEAWN2EKXGLSOBTL7O57V7NC/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7WX5YE66CT7Y5C2HTHXSFDKQWYWYWJ2T/
- https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2021-33640&packageName=libtar
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S4PJRCJLEAWN2EKXGLSOBTL7O57V7NC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WX5YE66CT7Y5C2HTHXSFDKQWYWYWJ2T/
Frequently Asked Questions
What is CVE-2021-33640?
CVE-2021-33640 is a vulnerability in the libtar.c library that allows for the use of released memory, resulting in a use-after-free scenario.
How severe is CVE-2021-33640?
CVE-2021-33640 has a severity rating of 9.8 (Critical).
Which software versions are affected by CVE-2021-33640?
CVE-2021-33640 affects Huawei Openeuler 20.03 SP1 and SP2, Huawei Openeuler 22.03, and Fedoraproject Fedora 36 and 37.
How can I fix CVE-2021-33640?
To fix CVE-2021-33640, update your affected software to a version that includes the necessary patches and security fixes.
Where can I find more information about CVE-2021-33640?
More information about CVE-2021-33640 can be found at the following references: [Link 1](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4S4PJRCJLEAWN2EKXGLSOBTL7O57V7NC/), [Link 2](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7WX5YE66CT7Y5C2HTHXSFDKQWYWYWJ2T/), [Link 3](https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2021-33640&packageName=libtar)
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- collector/mitre-cve
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- vendor/huawei
- canonical/huawei openeuler
- version/huawei openeuler/20.03-sp1
- version/huawei openeuler/20.03-sp2
- version/huawei openeuler/22.03
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- version/fedoraproject fedora/37