Multiple vulnerabilities in Siemens SIMATIC S7-PLCSIM
| Risk | Medium |
| Patch available | NO |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2021-25673 CVE-2021-25674 CVE-2021-25675 |
| CWE-ID | CWE-835 CWE-476 CWE-369 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
SIMATICS S7-PLCSIM Server applications / SCADA systems |
| Vendor | Siemens |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Infinite loop
EUVDB-ID: #VU51367
Risk: Medium
CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]
CVE-ID: CVE-2021-25673
CWE-ID:
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop. A remote authenticated attacker can use a specially crafted file to consume all available system resources and cause denial of service conditions.
MitigationCybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsSIMATICS S7-PLCSIM: 5.4
External linkshttp://ics-cert.us-cert.gov/advisories/icsa-21-068-01
http://cert-portal.siemens.com/productcert/pdf/ssa-256092.pdf
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) NULL pointer dereference
EUVDB-ID: #VU51368
Risk: Medium
CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]
CVE-ID: CVE-2021-25674
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error. A remote authenticated attacker can use a specially crafted file and perform a denial of service (DoS) attack.
MitigationCybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsSIMATICS S7-PLCSIM: 5.4
External linkshttp://ics-cert.us-cert.gov/advisories/icsa-21-068-01
http://cert-portal.siemens.com/productcert/pdf/ssa-256092.pdf
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Division by zero
EUVDB-ID: #VU51369
Risk: Medium
CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]
CVE-ID: CVE-2021-25675
CWE-ID:
CWE-369 - Divide By Zero
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to division by zero error in the application when it is used to open a specially crafted file. A remote authenticated can cause a denial of service condition on the target system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsSIMATICS S7-PLCSIM: 5.4
External linkshttp://ics-cert.us-cert.gov/advisories/icsa-21-068-01
http://cert-portal.siemens.com/productcert/pdf/ssa-256092.pdf
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
