OS Command Injection in OTRS

1) OS Command Injection

EUVDB-ID: #VU37774

Risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-16921

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: Yes

Description

The vulnerability allows a remote authenticated user to execute arbitrary code.

In OTRS 6.0.x up to and including 6.0.1, OTRS 5.0.x up to and including 5.0.24, and OTRS 4.0.x up to and including 4.0.26, an attacker who is logged into OTRS as an agent can manipulate form parameters (related to PGP) and execute arbitrary shell commands with the permissions of the OTRS or web server user.

Mitigation

Install update from vendor's website.

Vulnerable software versions

OTRS: 4.0.1 - 6.0.1

Debian Linux: 4.0.1 - 9.0

CPE2.3

• cpe:2.3:a:otrs_org:open_ticket_request_system:4.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:otrs_org:open_ticket_request_system:4.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:otrs_org:open_ticket_request_system:4.0.3:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:4.0.1:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:4.0.2:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:4.0.3:*:*:*:*:*:*:*

External links

http://lists.debian.org/debian-lts-announce/2017/12/msg00015.html
http://www.debian.org/security/2017/dsa-4066
http://www.exploit-db.com/exploits/43853/
http://www.otrs.com/security-advisory-2017-09-security-update-otrs-framework/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.