#VU28935 Heap-based buffer overflow in Siemens products - CVE-2020-7586

Vulnerability identifier: #VU28935

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-7586

CWE-ID: CWE-122

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
SIMATIC PCS 7
Server applications / SCADA systems
SIMATIC PDM
Server applications / SCADA systems
SIMATIC STEP 7
Server applications / SCADA systems
SINAMICS STARTER
Other software / Other software solutions

Vendor: Siemens

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error. A local user can pass specially crafted data to the applicatoin, trigger heap-based buffer overflow and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIMATIC PCS 7: All versions

SIMATIC PDM: All versions

SIMATIC STEP 7: before 5.6 SP2 HF3

SINAMICS STARTER: before 5.4 HF1

---

External links
https://ics-cert.us-cert.gov/advisories/icsa-20-161-05
https://cert-portal.siemens.com/productcert/pdf/ssa-689942.pdf

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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