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;