#VU26581 Deserialization of Untrusted Data in Laravel Framework - CVE-2018-15133

Vulnerability identifier: #VU26581

Vulnerability risk: Medium

CVSSv4.0: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Green]

CVE-ID: CVE-2018-15133

CWE-ID: CWE-502

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Laravel Framework
Client/Desktop applications / Software for system administration

Vendor: Laravel LLC

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data passed via the X-XSRF-TOKEN token in decrypt() method from Illuminate/Encryption/Encrypter.php and PendingBroadcast() method from gadgetchains/Laravel/RCE/3/chain.php in phpggc. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires knowledge of application key.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Laravel Framework: 5.5.0 - 5.6.29

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External links
https://laravel.com/docs/5.6/upgrade#upgrade-5.6.30

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.