GeoVision GV-I/O Box 4E libNetSetObj.so OS command injection vulnerability

Multiple OS command injection vulnerabilities exist in the libNetSetObj.so functionality of GeoVision GV-I/O Box 4E 2.09. A specially crafted network packet can lead to command execution. An attacker can send a network request to trigger this vulnerability.

`libNetSetObj.so` is an internal library used by various binaries on the device to configure the network stack (start and stop various services, configure IP, Netmask, gateway, dns, etc.)

#### CNetSetObj::m_F_n_Set_DNS_Addr command injection

The following function can take up to two addresses, performs no sanitization and then calls `system`. This is a classic command injection vulnerability. The function is reachable from both the network-exposed `DVRSearch` service and the `Network.cgi` endpoint.

int __fastcall CNetSetObj::m_F_n_Set_DNS_Addr(CNetSetObj *this, char *dns1, char *dns2)

{

int result; // r0

char v5[80]; // [sp+0h] [bp-50h] BYREF

if ( !dns1 )

result = 0;

if ( dns1 )

{

sprintf(v5, "/bin/echo nameserver %s > /etc/resolv.conf", dns1); // attacker controlled dns1 field

system(v5);

if ( dns2 )

{

sprintf(v5, "/bin/echo nameserver %s >> /etc/resolv.conf", dns2);

system(v5);

}

return 1;

}

return result;