CVE-2015-3440 : Détail

CVE-2015-3440

Cross-site Scripting
A03-Injection
64.1%V3
Network
2015-08-03
12h00 +00:00
2016-12-02
19h57 +00:00
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Descriptions du CVE

Cross-site scripting (XSS) vulnerability in wp-includes/wp-db.php in WordPress before 4.2.1 allows remote attackers to inject arbitrary web script or HTML via a long comment that is improperly stored because of limitations on the MySQL TEXT data type.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N [email protected]

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

Informations sur l'Exploit

Exploit Database EDB-ID : 36844

Date de publication : 2015-04-26 22h00 +00:00
Auteur : klikki
EDB Vérifié : Yes

Source: http://klikki.fi/adv/wordpress2.html ## Overview Current versions of WordPress are vulnerable to a stored XSS. An unauthenticated attacker can inject JavaScript in WordPress comments. The script is triggered when the comment is viewed. If triggered by a logged-in administrator, under default settings the attacker can leverage the vulnerability to execute arbitrary code on the server via the plugin and theme editors. Alternatively the attacker could change the administrator’s password, create new administrator accounts, or do whatever else the currently logged-in administrator can do on the target system. ## Details If the comment text is long enough, it will be truncated when inserted in the database. The MySQL TEXT type size limit is 64 kilobytes, so the comment has to be quite long. The truncation results in malformed HTML generated on the page. The attacker can supply any attributes in the allowed HTML tags, in the same way as with the two recently published stored XSS vulnerabilities affecting the WordPress core. The vulnerability bears a similarity to the one reported by Cedric Van Bockhaven in 2014 (patched this week, after 14 months). Instead of using an invalid character to truncate the comment, this time an excessively long comment is used for the same effect. In these two cases, the injected JavaScript apparently can't be triggered in the administrative Dashboard so these exploits seem to require getting around comment moderation e.g. by posting one harmless comment first. The similar vulnerability released by Klikki in November 2014 could be exploited in the administrative Dashboard while the comment is still in the moderation queue. Some exploit attempts of this have been recently reported in the wild. ## Proof of Concept Enter as a comment text: <a title='x onmouseover=alert(unescape(/hello%20world/.source)) style=position:absolute;left:0;top:0;width:5000px;height:5000px AAAAAAAAAAAA...[64 kb]..AAA'></a> Confirmed vulnerable: WordPress 4.2, 4.1.2, 4.1.1, 3.9.3. Tested with MySQL versions 5.1.53 and 5.5.41. ## Demo https://www.youtube.com/watch?v=OCqQZJZ1Ie4

Products Mentioned

Configuraton 0

Debian>>Debian_linux >> Version 7.0

Debian>>Debian_linux >> Version 8.0

Configuraton 0

Wordpress>>Wordpress >> Version To (including) 4.2

Références

https://www.exploit-db.com/exploits/36844/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/74334
Tags : vdb-entry, x_refsource_BID
http://seclists.org/fulldisclosure/2015/Apr/84
Tags : mailing-list, x_refsource_FULLDISC
http://osvdb.org/show/osvdb/121320
Tags : vdb-entry, x_refsource_OSVDB
http://www.securitytracker.com/id/1032199
Tags : vdb-entry, x_refsource_SECTRACK
http://www.debian.org/security/2015/dsa-3250
Tags : vendor-advisory, x_refsource_DEBIAN