#VU256 Modification of user accounts in Vtiger CRM - CVE-2016-4834

Vulnerability identifier: #VU256

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-4834

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Vtiger CRM
Other software / Other software solutions

Vendor: Vtiger

Description
The vulnerability allows a remote attacker to modify user data on the target system.

The vulnerability exists due to a flaw in 'modules/Users/actions/Save.php' in the Users_Save_Action class. A remote authenticated attacker can create or modify user accounts via unspecified vectors.

Successful exploitation of this vulnerability may result in modification of system information.

Mitigation
A source code fix is available at:

http://code.vtiger.com/vtiger/vtigercrm/commit/7cdf9941197b4aa58114eafce3ce88fb418eb68c

Vulnerable software versions

Vtiger CRM: 6.4.0

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External links
https://jvndb.jvn.jp/en/contents/2016/JVNDB-2016-000126.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.