#VU97431 NULL pointer dereference in Siemens products - CVE-2023-30756

Vulnerability identifier: #VU97431

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-30756

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC HMI Comfort Panels
Server applications / SCADA systems
SIMATIC IPC DiagBase
Server applications / SCADA systems
SIMATIC IPC DiagMonitor
Server applications / SCADA systems
SIMATIC WinCC Runtime Advanced
Server applications / SCADA systems
SIMATIC CP 1242-7 V2
Hardware solutions / Firmware
SIMATIC CP 1243-1
Hardware solutions / Firmware
SIMATIC CP 1243-1 DNP3
Hardware solutions / Firmware
SIMATIC CP 1243-1 IEC
Hardware solutions / Firmware
SIMATIC CP 1243-7 LTE
Hardware solutions / Firmware
SIMATIC CP 1243-8 IRC
Hardware solutions / Firmware
SIPLUS TIM 1531 IRC
Hardware solutions / Firmware
TIM 1531 IRC
Hardware solutions / Firmware

Vendor: Siemens

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 in the web server. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIMATIC HMI Comfort Panels: All versions

SIMATIC IPC DiagBase: All versions

SIMATIC IPC DiagMonitor: All versions

SIMATIC WinCC Runtime Advanced: All versions

SIMATIC CP 1242-7 V2: before 3.5.20

SIMATIC CP 1243-1: before 3.5.20

SIMATIC CP 1243-1 DNP3: before 3.5.20

SIMATIC CP 1243-1 IEC: before 3.5.20

SIMATIC CP 1243-7 LTE: before 3.5.20

SIMATIC CP 1243-8 IRC: before 3.5.20

SIPLUS TIM 1531 IRC: before 2.4.8

TIM 1531 IRC: before 2.4.8

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External links
https://cert-portal.siemens.com/productcert/html/ssa-423808.html

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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.