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Tool Directory

CVE-2021-33393

HighPublished

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...

Published: Jun 9, 2021
Updated: Aug 3, 2024
Assigning CNA: mitre
Evidence observed: May 17, 2021

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

58.7%

High · next 30 days

Percentile: 99.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

IPFire_2.25_RCE_AuthenticatedExploit
This exploit is based on CVE-2021-33393 and was built upon the original exploit by Mücahit Saratar, extending it to achieve a reverse shell with root privileges.
IPFire 2.25 - Remote Code Execution (Authenticated)Exploit
Mücahit Saratar · cgi · May 17, 2021

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