WordPress Advanced Access Manager 2.8.2 File Write / Code Execution

Credit: Tom Adams
Risk: High
Local: No
Remote: Yes

CVSS Base Score: 6.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

Details ================ Software: Advanced Access Manager Version: 2.8.2 Homepage: http://wordpress.org/plugins/advanced-access-manager/ Advisory report: https://security.dxw.com/advisories/advanced-access-manager-allows-admin-users-to-write-arbitrary-text-to-arbitrary-locations-which-could-lead-to-arbitrary-code-execution-etc/ CVE: CVE-2014-6059 CVSS: 6.5 (Medium; AV:N/AC:L/Au:S/C:P/I:P/A:P) Description ================ Advanced Access Manager allows admin users to write arbitrary files and execute arbitrary php Vulnerability ================ Advanced Access Manager allows writing arbitrary content to arbitrary files. Depending on the server configuration this couldallow arbitrary code execution, overwriting core WordPress files and e.g. blankingwp-config.php. In other configurations this could lead to overwriting files in the uploads directory. Proof of concept ================ Visit http://localhost/wp-admin/admin.php?page=aam-configpress Press “Save” (this creates the “aam_configpress” option) Visit http://localhost/wp-admin/options.php Set “aam_configpress” to “test.php Press “Save Changes Visit http://localhost/wp-admin/admin.php?page=aam-configpress again Enter “<?php phpinfo();” into the textarea (without the quotes) Press “Save Visit http://localhost/wp-content/aam/test.php Note that there is no restriction on using “../” in the “aam_configpress” option so depending on server configuration you could create files anywhere on the filesystem. This attack could be scripted to allow upload of binary files, including executable files. Mitigations ================ Upgrade to version 2.8.3 or later Disclosure policy ================ dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy: https://security.dxw.com/disclosure/ Please contact us on security@dxw.com to acknowledge this report if you received it via a third party (for example, plugins@wordpress.org) as they generally cannot communicate with us on your behalf. This vulnerability will be published if we do not receive a response to this report with 14 days. Timeline ================ 2014-08-20: Discovered 2014-09-01: Reported to author via email 2014-09-01:Requested CVE 2014-09-01:Developer responded 2014-09-02:Developer reported the issue fixed 2014-09-03: Advisory published Discovered by dxw: ================ Tom Adams Please visit security.dxw.com for more information.

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