#VU40590 Input validation error in vBulletin - CVE-2015-7808

Vulnerability identifier: #VU40590

Vulnerability risk: Medium

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:A/U:Green]

CVE-ID: CVE-2015-7808

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
vBulletin
Web applications / Forum & blogging software

Vendor: vBulletin

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The vB_Api_Hook::decodeArguments method in vBulletin 5 Connect 5.1.2 through 5.1.9 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via a crafted serialized object in the arguments parameter to ajax/api/hook/decodeArguments.

Mitigation
Install update from vendor's website.

Vulnerable software versions

vBulletin: 5.0.0 - 5.1.9

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External links
https://blog.checkpoint.com/2015/11/05/check-point-discovers-critical-vbulletin-0-day/
https://packetstormsecurity.com/files/134331/vBulletin-5.1.2-Unserialize-Code-Execution.html
https://pastie.org/pastes/10527766/text?key=wq1hgkcj4afb9ipqzllsq
https://www.rapid7.com/db/modules/exploit/multi/http/vbulletin_unserialize
https://blog.sucuri.net/2015/11/vbulletin-exploits-in-the-wild.html
https://www.exploit-db.com/exploits/38629/

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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?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.