Multiple vulnerabilities in Siemens SIPROTEC 4 7SJ66 Devices

1) Integer underflow

EUVDB-ID: #VU19580

Risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-12255

CWE-ID: CWE-191 - Integer underflow

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer underflow when processing TCP packets with URG-flag set. A remote attacker can send a specially crafted TCP request to the affected system, trigger integer underflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIPROTEC 4 7SJ66: before 4.41

External links

http://cert-portal.siemens.com/productcert/txt/ssa-617233.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

2) Stack-based buffer overflow

EUVDB-ID: #VU19578

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12256

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing IPv4 options. A remote unauthenticated attacker can send specially crafted network traffic to the affected system, trigger stack-based buffer overflow and execute arbitrary code on the target system or crash the tNet0 task.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIPROTEC 4 7SJ66: before 4.41

External links

http://cert-portal.siemens.com/productcert/txt/ssa-617233.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Input validation error

EUVDB-ID: #VU19584

Risk: Low

CVSSv3.1: 4 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C]

CVE-ID: CVE-2019-12258

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation when processing options in TCP packets. A remote attacker can a specially crafted TCP packet with the source and destination TCP-port and IP-addresses of an existing session can reset the TCP session, leading to a DoS attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIPROTEC 4 7SJ66: before 4.41

External links

http://cert-portal.siemens.com/productcert/txt/ssa-617233.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.

4) NULL pointer dereference

EUVDB-ID: #VU19586

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12259

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error when processing IGMP packets. A remote attacker can send specially crafted traffic to the affected system and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIPROTEC 4 7SJ66: before 4.41

External links

http://cert-portal.siemens.com/productcert/txt/ssa-617233.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Buffer overflow

EUVDB-ID: #VU19581

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12260

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing TCP-segments where the last step is a TCP-segment with the URG-flag set due to TCP Urgent Pointer state confusion caused by malformed TCP AO option. A remote attacker can send specially crafted TCP traffic to the affected system, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIPROTEC 4 7SJ66: before 4.41

External links

http://cert-portal.siemens.com/productcert/txt/ssa-617233.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Buffer overflow

EUVDB-ID: #VU19582

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12261

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when sending responses to TCP requests due to TCP Urgent Pointer state confusion during connect() to a remote host. A remote attacker can trigger the system to initiate TCP connection to a malicious host, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIPROTEC 4 7SJ66: before 4.41

External links

http://cert-portal.siemens.com/productcert/txt/ssa-617233.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

7) Input validation error

EUVDB-ID: #VU19587

Risk: Low

CVSSv3.1: 5 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12262

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing unsolicited Reverse ARP replies. A remote attacker can send specially crafted traffic and perform denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIPROTEC 4 7SJ66: before 4.41

External links

http://cert-portal.siemens.com/productcert/txt/ssa-617233.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

8) Race condition

EUVDB-ID: #VU19583

Risk: Low

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-12263

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to a race condition when processing TCP packets. A remote unauthenticated attacker can send malicious sequence of TCP packets within a specific timing, trigger a race condition and perform denial of service attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIPROTEC 4 7SJ66: before 4.41

External links

http://cert-portal.siemens.com/productcert/txt/ssa-617233.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

9) Memory leak

EUVDB-ID: #VU19588

Risk: Low

CVSSv3.1: 4.1 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2019-12265

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due memory leak when processing IGMPv3 packets. A remote attacker can create a fragmented IGMPv3 query report and read memory contents in the response message.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIPROTEC 4 7SJ66: before 4.41

External links

http://cert-portal.siemens.com/productcert/txt/ssa-617233.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.