corelight/cve-2021-1675Script de Zeek y reglas de Suricata para detectar la explotación de PrintNightmare (CVE-2021-1675) a través de eventos RPC DCE de RpcAddPrinterDriver, con pruebas basadas en PCAP.
Este script de Zeek detecta eventos exitosos de DCE RPC RpcAddPrinterDriver{,Ex}, que son necesarios para explotar con éxito la vulnerabilidad. Las pruebas se basan en el PCAP de explotación de Lares Lab. Probado con las versiones de Zeek 3.0.2 y 4.0.1.
Printer_Driver_Changed_Successfully indica que el controlador de impresora se cambió correctamente.También hemos proporcionado reglas de Suricata para detectar los comandos DCE RPC utilizados en este exploit. Estas se pueden cargar en un dispositivo Corelight o ejecutarse directamente con Suricata. Estas reglas se activan mucho en redes más grandes y pueden ser demasiado ruidosas para ser útiles. Úselas con precaución. Las hemos mantenido aquí por si resultan útiles en otras redes. En nuestra opinión, el paquete de Zeek es más robusto frente al ruido.
The output of running Suricata with the provided ruleset is shown below:
$ suricata -r testing/Traces/PrintNightmare.pcap -S suricata.rules
8/7/2021 -- 10:54:57 - <Notice> - This is Suricata version 6.0.3 RELEASE running in USER mode
8/7/2021 -- 10:54:57 - <Warning> - [ERRCODE: SC_WARN_ERSPAN_CONFIG(329)] - ERSPAN Type I is no longer configurable and it is always enabled; ignoring configuration setting.
8/7/2021 -- 10:54:57 - <Notice> - all 17 packet processing threads, 4 management threads initialized, engine started.
8/7/2021 -- 10:54:57 - <Notice> - Signal Received. Stopping engine.
8/7/2021 -- 10:54:57 - <Notice> - Pcap-file module read 1 files, 53 packets, 19124 bytes
$ cat fast.log
07/02/2021-08:11:57.785982 [**] [1:3000007:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriver [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:57.824060 [**] [1:3000007:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriver [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:57.848240 [**] [1:3000007:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriver [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:57.848240 [**] [1:3000008:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriverEx [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:57.894097 [**] [1:3000007:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriver [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:57.894097 [**] [1:3000008:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriverEx [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:57.959051 [**] [1:3000007:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriver [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:57.959051 [**] [1:3000008:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriverEx [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:58.000581 [**] [1:3000007:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriver [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:58.000581 [**] [1:3000008:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriverEx [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:11:58.007953 [**] [1:3000007:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriver [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:12:08.520328 [**] [1:3000007:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriver [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445
07/02/2021-08:12:08.520328 [**] [1:3000008:2] CORELIGHT Possible CVE-2021-34527 (PrintNightmare) Exploit - SpoolSS RpcAddPrinterDriverEx [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 192.168.1.149:50070 -> 192.168.1.157:445