# CVE-2021-23177: libarchive: An improper link resolution flaw while extracting an archive can lead to changing the access control list (ACL) of th...

CVE-2021-23177 is fixed in 5 products on 1 platform, first by libarchive-tools 3.4.0-2ubuntu1.1, released December 23, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-23177
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0039
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 23, 2021

## Description

An improper link resolution flaw while extracting an archive can lead to changing the access control list (ACL) of the target of the link. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. A local attacker may use this flaw to change the ACL of a file on the system and gain more privileges.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bsdtar RHEL 8 | 0:3.3.3-3.el8_5 | [RHSA-2022:0892](https://patchblox.com/security/data/fix/linux/rhsa-2022-0892.md) | Mar 15, 2022 |
| Linux | bsdtar almalinux 8 | 3.3.3-3.el8_5 | [ALSA-2022:0892](https://patchblox.com/security/data/fix/linux/alsa-2022-0892.md) | Mar 15, 2022 |
| Linux | bsdtar ol 8 | 0:3.3.3-3.el8_5 | [ELSA-2022-0892](https://patchblox.com/security/data/fix/linux/elsa-2022-0892.md) | Mar 16, 2022 |
| Linux | libarchive Debian 12.15 (bookworm) | 3.5.2-1 | [DEBIAN-CVE-2021-23177](https://patchblox.com/security/data/fix/linux/debian-cve-2021-23177.md) | Aug 23, 2022 |
| Linux | libarchive Debian 13.5 (trixie) | 3.5.2-1 | [DEBIAN-CVE-2021-23177](https://patchblox.com/security/data/fix/linux/debian-cve-2021-23177.md) | Aug 23, 2022 |
| Linux | libarchive Debian 14 | 3.5.2-1 | [DEBIAN-CVE-2021-23177](https://patchblox.com/security/data/fix/linux/debian-cve-2021-23177.md) | Aug 23, 2022 |
| Linux | libarchive RHEL 8 | 0:3.3.3-3.el8_5 | [RHSA-2022:0892](https://patchblox.com/security/data/fix/linux/rhsa-2022-0892.md) | Mar 15, 2022 |
| Linux | libarchive almalinux 8 | 3.3.3-3.el8_5 | [ALSA-2022:0892](https://patchblox.com/security/data/fix/linux/alsa-2022-0892.md) | Mar 15, 2022 |
| Linux | libarchive ol 8 | 0:3.3.3-3.el8_5 | [ELSA-2022-0892](https://patchblox.com/security/data/fix/linux/elsa-2022-0892.md) | Mar 16, 2022 |
| Linux | libarchive rocky 8 | 0:3.3.3-3.el8_5 | [RLSA-2022:0892](https://patchblox.com/security/data/fix/linux/rlsa-2022-0892.md) | Mar 15, 2022 |
| Linux | libarchive-devel RHEL 8 | 0:3.3.3-3.el8_5 | [RHSA-2022:0892](https://patchblox.com/security/data/fix/linux/rhsa-2022-0892.md) | Mar 15, 2022 |
| Linux | libarchive-devel almalinux 8 | 3.3.3-3.el8_5 | [ALSA-2022:0892](https://patchblox.com/security/data/fix/linux/alsa-2022-0892.md) | Mar 15, 2022 |
| Linux | libarchive-devel ol 8 | 0:3.3.3-3.el8_5 | [ELSA-2022-0892](https://patchblox.com/security/data/fix/linux/elsa-2022-0892.md) | Mar 16, 2022 |
| Linux | libarchive-tools Ubuntu 20.04 LTS (focal) | 3.4.0-2ubuntu1.1 | [libarchive-tools 3.4.0-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libarchive-tools-3.4.0-2ubuntu1.1.md) | Dec 23, 2021 |
| Linux | libarchive13 Ubuntu 20.04 LTS (focal) | 3.4.0-2ubuntu1.1 | [libarchive13 3.4.0-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libarchive13-3.4.0-2ubuntu1.1.md) | Dec 23, 2021 |

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