#VU65293 Use of insufficiently random values in Siemens products - CVE-2022-26647

Vulnerability identifier: #VU65293

Vulnerability risk: High

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

CVE-ID: CVE-2022-26647

CWE-ID: CWE-330

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
SCALANCE X200-4P IRT
SCALANCE X201-3P IRT
SCALANCE X201-3P IRT PRO
SCALANCE X202-2IRT
SCALANCE X202-2P IRT
SCALANCE X202-2P IRT PRO
SCALANCE X204IRT
SCALANCE X204IRT PRO
SCALANCE XF201-3P IRT
SCALANCE XF202-2P IRT
SCALANCE XF204-2BA IRT
SCALANCE XF204IRT
SCALANCE X204-2
SCALANCE X204-2FM
SCALANCE X204-2LD
SCALANCE X204-2LD TS
SCALANCE X204-2TS
SCALANCE X206-1
SCALANCE X206-1LD
SCALANCE X208
SCALANCE X208PRO
SCALANCE X212-2
SCALANCE X212-2LD
SCALANCE X216
SCALANCE X224
SCALANCE XF204
SCALANCE XF204-2
SCALANCE XF206-1
SCALANCE XF208

Software vendor:
Siemens

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the webserver of affected devices calculates session ids and nonces in an insecure manner. A remote attacker can brute-force session ids and hijack existing sessions.

Install updates from vendor's website.

• https://cert-portal.siemens.com/productcert/pdf/ssa-310038.pdficsa-22-195-01