Vulnerability identifier: #VU39561

Vulnerability risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-7138

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Plone
Web applications / CMS

Vendor: Plone

Description

Vulnerability allows a remote attacker to perform XSS attacks.

The vulnerability is caused by an input validation error in the URL checking infrastructure in Plone CMS 5.x through 5.0.6, 4.x through 4.3.11, and 3.3.x through 3.3.6. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in victim's browser in security context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Plone: 3.3 - 5.1a1

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External links
http://packetstormsecurity.com/files/139110/Plone-CMS-4.3.11-5.0.6-XSS-Traversal-Open-Redirection.html
http://seclists.org/fulldisclosure/2016/Oct/80
http://www.openwall.com/lists/oss-security/2016/09/05/4
http://www.openwall.com/lists/oss-security/2016/09/05/5
http://www.securityfocus.com/archive/1/539572/100/0/threaded
http://www.securityfocus.com/bid/92752
http://plone.org/security/hotfix/20160830/non-persistent-xss-in-plone-1

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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.