SB2021031006 - Multiple vulnerabilities in Siemens SIMATIC S7-PLCSIM

Description

This security bulletin contains information about 3 vulnerabilities.

1) Infinite loop (CVE-ID: CVE-2021-25673)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The 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.

2) NULL pointer dereference (CVE-ID: CVE-2021-25674)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The 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.

3) Division by zero (CVE-ID: CVE-2021-25675)

CWE-ID: CWE-369 - Divide By Zero

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The 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.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://ics-cert.us-cert.gov/advisories/icsa-21-068-01
• https://cert-portal.siemens.com/productcert/pdf/ssa-256092.pdf