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SugarCRM 6.5.18 fopen() Command Injection / XSS / SSRF

Posted on 24 June 2016

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SugarCRM <= 6.5.18 (MySugar::addDashlet) Insecure fopen() Usage Vulnerability
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[-] Software Link:

http://www.sugarcrm.com/

[-] Affected Versions:

Version 6.5.18 CE and other versions.

[-] Vulnerability Description:

The vulnerable code is located within the MySugar::addDashlet() method:

89. if (isset($_REQUEST['type']) && $_REQUEST['type'] == 'web') {
90. $dashlet_module = 'Home';
91. require_once('include/Dashlets/DashletRssFeedTitle.php');
92. $options['url'] = $_REQUEST['type_module'];
93. $webDashlet = new DashletRssFeedTitle($options['url']);
94. $options['title'] = $webDashlet->generateTitle();

User input passed through the "type_module" request parameter isn’t properly sanitized before being used
to instantiate a new DashletRssFeedTitle object, and this could be exploited to carry out certain attacks
because of the DashletRssFeedTitle::readFeed() method (user input passed directly to the "fopen()" function):

71. public function readFeed() {
72. if ($this->url) {
73. $fileOpen = @fopen($this->url, 'r');
74. if ($fileOpen) {
75. $this->fileOpen = true;
76. $this->contents = fread($fileOpen, $this->readBytes);
77. fclose($fileOpen);
78. return true;
79. }

This can be exploited by authenticated attackers to carry out Server-Side Request Forgery (SSRF) attacks,
potentially read content of arbitrary files, initiate a Cross-Site Scripting (XSS) attack, or execute
arbitrary OS commands when the "expect" extension is installed through the following URL:

http://[host]/[sugar]/index.php?module=Home&action=DynamicAction&DynamicAction=addDashlet&id=1&type=web&type_module=expect://[cmd]

[-] Solution:

Update to version 6.5.19 CE or higher to partially mitigate the vulnerability.
No official solution is currently available against the SSRF and XSS attack vectors.

[-] Disclosure Timeline:

[15/10/2014] - Vendor notified
[15/12/2014] - Version 6.5.19 CE released: http://bit.do/sugar6519
[29/04/2015] - CVE number requested
[23/06/2016] - Public disclosure

[-] CVE Reference:

The Common Vulnerabilities and Exposures project (cve.mitre.org)
has not assigned a CVE identifier for this vulnerability.

[-] Credits:

Vulnerability discovered by Egidio Romano.

[-] Original Advisory:

http://karmainsecurity.com/KIS-2016-06

 

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