#VU3035 Arbitrary file upload in TimThumb - CVE-2011-4106

Vulnerability identifier: #VU3035

Vulnerability risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2011-4106

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
TimThumb
Web applications / Modules and components for CMS

Vendor: TimThumb

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

The vulnerability exists due to improper storing of content in the cache directory when processing input. A remote attacker can send a specially crafted HTTP request containing a white-listed domain in the src parameter, upload a malicious PHP script and execute arbitrary PHP code.

Successful exploitation of the vulnerability may allow an attacker to execute arbitrary PHP code on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation
Update to version 2.0.

Vulnerable software versions

TimThumb: 1.99

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External links
https://code.google.com/archive/p/timthumb/issues/212

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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.