A command injection vulnerability exists in the upnp_relay() function in multiple ipTIME router models. The controlURL value used to pass port-forwarding information to an upper router is passed to system() without proper validation or sanitization, enabling injection of arbitrary shell metacharacters/commands and resulting in OS command execution on the device.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
Repository is a focused educational reproduction of CVE-2025-55423 affecting ipTIME A604M firmware. It is not a generic framework module; it contains both exploit scaffolding and extensive reverse-engineering documentation. The core exploit chain is: a fake SSDP server answers WAN-side M-SEARCH, a fake HTTP server serves a crafted UPnP device description XML whose first controlURL contains shell metacharacters, the target firmware's internal upnpc accepts that IGD and prints/stores the resulting URL as igd_url, and the vulnerable upnp_relay function later builds a shell command using '/sbin/upnpc -u <igd_url> ...' via system2/system, causing command injection. Repository structure: 6 markdown docs explain background, attack scenario, vulnerable function analysis, miniupnpc chain tracing, attacker server setup, and QEMU-based RCE triggering. The actual code lives under exploits/: ssdp_server.py implements UDP SSDP discovery responses; http_server.py serves attacker.xml and the two SOAP POST responses required by miniupnpc (GetStatusInfo and GetExternalIPAddress); attacker.xml is the malicious UPnP description document with injected controlURL; call_rce.c is a QEMU mipsel user-mode harness that dlopens firmware libraries, sets igd_url directly, and invokes upnp_relay to prove the sink; stub.c overrides hardware-dependent WAN functions so the harness works without real router hardware. Main exploit capabilities: (1) network impersonation of an upstream IGD over SSDP/HTTP, (2) delivery of attacker-controlled controlURL into the target's igd_url state, and (3) triggering command injection/RCE through upnp_relay. The included payloads are basic hardcoded shell-command markers (;PWNED, ';touch /tmp/pwned;#'), so maturity is operational rather than weaponized. The repo is a real exploit reproduction, not merely detection, though it intentionally omits DHCP hijack/ARP spoof automation and firmware binaries.
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