Path traversal in b2evolution - CVE-2017-5539
Published: January 23, 2017 / Updated: August 8, 2020
Vulnerability identifier: #VU39804
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2017-5539
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: b2evolution.net
Affected software:
b2evolution
b2evolution
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
The patch for directory traversal (CVE-2017-5480) in b2evolution version 6.8.4-stable has a bypass vulnerability. An attacker can use ../ to bypass the filter rule. Then, this attacker can exploit this vulnerability to delete or read any files on the server. It can also be used to determine whether a file exists.
How to mitigate CVE-2017-5539
Install update from vendor's website.