Anon Proxy Server - Remote Code Execution

2007.12.20
Risk: High
Local: No
Remote: Yes
CWE: CWE-94


CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

By Michael Brooks Vulnerability type: Multiple Remote System commands execution. Software: Anon Proxy Server Home page:http://sourceforge.net/projects/anonproxyserver/ Affects version: 0.100 Example exploit: http://127.0.0.1/anon_proxy_server_0.100/diagdns.php?host=google.com%5C% 27+%26%26+cat+%2Fetc%2Fpasswd+%23 A virtually identical flaw exists in diagconnect.php however it takes longer to execute. Anon Proxy Server forces magic_quotes_gpc=on, However magic_quotes_gpc does not protect the system() function from taint. For protection you should use the escapeshellarg() function. Removing diagdns.php and diagconnect.php is the best temporary solution. Also magic_quotes_gpc is being removed in php6, so Anon Proxy Server will have to revamp there security. Peace


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