RCE in Sophos Web Appliance
CVE-2016-9554
The Sophos Web Appliance Remote / Secure Web Gateway server (version 4.2.1.3) is vulnerable to a Remote Command Injection vulnerability in its web administrative interface. These vulnerabilities occur in MgrDiagnosticTools.php (/controllers/MgrDiagnosticTools.php), in the component responsible for performing diagnostic tests with the UNIX wget utility. The application doesn't properly escape the information passed in the 'url' variable before calling the executeCommand class function ($this->dtObj->executeCommand). This function calls exec() with unsanitized user input allowing for remote command injection. The page that contains the vulnerabilities, /controllers/MgrDiagnosticTools.php, is accessed by a built-in command answered by the administrative interface. The command that calls to that vulnerable page (passed in the 'section' parameter) is: 'configuration'. Exploitation of this vulnerability yields shell access to the remote machine under the 'spiderman' user account.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.246 (97.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.246 · newest: 0.246 · change: 0.000
Affected products
- Sophos Web Appliance — versions 4.2.1.3
Weakness classification (CWE)
References
- www.securityfocus.com/bid/95858 (VDB Entry, Third Party Advisory, vdb-entry)
- pastebin.com/UB8Ye6ZU (Exploit)
- community.sophos.com/products/web-appliance/b/blog/posts/release-of-swa-version… (Release Notes)
Frequently asked questions
- What is CVE-2016-9554?
- CVE-2016-9554 is a high-severity vulnerability in Sophos Web Appliance, classified under Command Injection. CVSS score: 7.2/10. Published 2017-01-28.
- How severe is CVE-2016-9554?
- High severity. CVSS v3 base score is 7.2 out of 10.