Vulnerability identifier: #VU42366

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-4556

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SPIP
Web applications / CMS

Vendor: spip.net

Description

Vulnerability allows a remote attacker to perform XSS attacks.

The vulnerability is caused by an input validation error in the author page (prive/formulaires/editer_auteur.php) in SPIP before 2.1.24 and 3.0.x before 3.0.12 when processing url_site parameter. 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

SPIP: 2.0.0 - 2.0.22, 2.1.1 - 2.1.22, 3.0.0 - 3.0.11

---

External links
http://core.spip.org/projects/spip/repository/revisions/20879
http://core.spip.org/projects/spip/repository/revisions/20880
http://secunia.com/advisories/55551
http://www.openwall.com/lists/oss-security/2013/11/10/4
http://www.securitytracker.com/id/1029317
http://www.spip.net/fr_article5646.html
http://www.spip.net/fr_article5648.html
http://www.debian.org/security/2013/dsa-2794

---

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.