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CVE-2021-33393

8.8 · HIGH

lfs/backup in IPFire 2.25-core155 does not ensure that /var/ipfire/backup/bin/backup.pl is owned by the root account.

Published Jun 9, 2021EPSS 59.35%

Overview

CVE-2021-33393 is a high-severity vulnerability. It was published on June 9, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

lfs/backup in IPFire 2.25-core155 does not ensure that /var/ipfire/backup/bin/backup.pl is owned by the root account. It might be owned by an unprivileged account, which could potentially be used to install a Trojan horse backup.pl script that is later executed by root. Similar problems with the ownership/permissions of other files may be present as well.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/163158/IPFire-2.25-Remote-Code-Execution.htmlGitHubgithub.com/MucahitSaratar/ipfire-2-25-auth-rceGitHubgithub.com/ipfire/ipfire-2.x/commit/6769d909306d7bdc43d64598872126fcf1b217f6GitHubgithub.com/ipfire/ipfire-2.x/commits/master?since=2021-05-17&until=2021-05-17Refpacketstormsecurity.com/files/163158/IPFire-2.25-Remote-Code-Execution.htmlGitHubgithub.com/MucahitSaratar/ipfire-2-25-auth-rceGitHubgithub.com/ipfire/ipfire-2.x/commit/6769d909306d7bdc43d64598872126fcf1b217f6GitHubgithub.com/ipfire/ipfire-2.x/commits/master?since=2021-05-17&until=2021-05-17

How CyberStrike helps

Frequently asked questions

What is CVE-2021-33393?

CVE-2021-33393 is a high-severity vulnerability. It was published on June 9, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-33393?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-33393?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-33393?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-33393 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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