Directory traversal in Sympa

1) Path traversal

EUVDB-ID: #VU14737

Risk: Low

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-1000550

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote attacker to create or modify files on the filesystem.

The vulnerability exists due to input validation error when processing directory traversal sequences in wwsympa.fcgi when editing templates. A remote authenticated attacker can send a specially crafted HTTP GET or POST request and edit or create files on the system outside the webroot directory.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Sympa: 6.1.0 - 6.2b.9

External links

http://sympa-community.github.io/security/2018-001.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.