Misinterpretation of fsockopen calls in PHP 7.x before 2017-03-07 can lead to a security risk

CVE-2017-7189 · MEDIUM Severity

AV:N/AC:L/AU:N/C:P/I:N/A:N

main/streams/xp_socket.c in PHP 7.x before 2017-03-07 misparses fsockopen calls, such as by interpreting fsockopen('127.0.0.1:80', 443) as if the address/port were 127.0.0.1:80:443, which is later truncated to 127.0.0.1:80. This behavior has a security risk if the explicitly provided port number (i.e., 443 in this example) is hardcoded into an application as a security policy, but the hostname argument (i.e., 127.0.0.1:80 in this example) is obtained from untrusted input.

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