CVE-2021-41282

diag_routes.php in pfSense 2.5.2 allows sed data injection. Authenticated users are intended to be able to view data about the routes set in the firewall. The data is retrieved by executing the netstat utility, and then its output is parsed via the sed utility. Although the common protection mechanisms against command injection (i.e., the usage of the escapeshellarg function for the arguments) are used, it is still possible to inject sed-specific code and write an arbitrary file in an arbitrary location.

CVSS v3.1

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

CVSS v2.0

9.0 HIGHAV:N/AC:L/Au:S/C:C/I:C/A:C

EPSS

87.11% chance of exploitation in the next 30 days, 100th percentile

Nuclei

high · CWE-74

Published

2022-03-01

Updated

2024-08-04

Proof-of-concept exploits (3)

• http://packetstormsecurity.com/files/166208/pfSense-2.5.2-Shell-Upload.html
• https://www.shielder.it/advisories/pfsense-remote-command-execution/
• bantahacka/pfsense_2021-412822★ · 2022-10-06

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-41282.yaml

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/unix/http/pfsense_diag_routes_we…

References

• CVE Record
• NVD entry

Related

• CVE-2021-41278
• CVE-2021-41285
• CVE-2021-41277
• CVE-2021-41291
• CVE-2021-41269
• CVE-2021-41293