Path traversal and CSRF in wp_ajax_update_plugin() in WordPress WordPress



Published: 2016-08-20
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2016-10148
CVE-2016-6897
CVE-2016-6896
CWE ID CWE-352
CWE-22
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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WordPress
Web applications / CMS

Vendor WordPress.ORG

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Path traversal and CSRF in wp_ajax_update_plugin()

Risk: Medium

CVSSv3: 6.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H/E:F/RL:O/RC:C] [PCI]

CVE-ID: CVE-2016-10148,CVE-2016-6897,CVE-2016-6896

CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)

Exploit availability: Yes [Search exploit]

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive data and cause denial of service.

The vulnerability exists due to insufficient sanitization of directory traversal sequences passed via the "plugin" HTTP GET parameter to wp_ajax_update_plugin() function in "/wp-admin/admin-ajax.php" script. A remote authenticated attacker can send a specially crafted HTTP GET request to vulnerable file and read contents of arbitrary file on the vulnerable system. Additionaly, it is possible to cause denial of service conditions by repeatedly reading /dev/random file and depleting the entropy pool.

This vulnerability can be exploited via CSRF attack, which will allow a remote unauthenticated attacker to cause denial of service of the target system.

Mitigation

Update to version 4.6.

Vulnerable software versions

WordPress: 4.2, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.5, 4.2.6, 4.2.7, 4.2.8, 4.2.9, 4.3, 4.3.1, 4.3.2, 4.3.3, 4.3.4, 4.3.5, 4.4, 4.4.2, 4.4.3, 4.4.4, 4.5, 4.5.1, 4.5.2, 4.5.3

CPE External links

https://sumofpwn.nl/advisory/2016/path_traversal_vulnerability_in_wordpress_core_ajax_handlers.html
https://codex.wordpress.org/Version_4.6

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.



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