CVE-2021-40359 Path traversal in OpenPCS 7 V8.2
Attackers can read critical files outside restricted directories via path traversal in Siemens SIMATIC software during file downloads.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-40359?
CVE-2021-40359 is a high-severity path traversal vulnerability in Siemens OpenPCS 7 V8.2, published on 9 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been identified in OpenPCS 7 V8.2 (All versions), OpenPCS 7 V9.0 (All versions < V9.0 Upd4), OpenPCS 7 V9.1 (All versions), SIMATIC BATCH V8.2 (All versions), SIMATIC BATCH V9.0 (All versions), SIMATIC BATCH V9.1 (All versions), SIMATIC NET PC Software V14 (All versions), SIMATIC NET PC Software V15 (All versions), SIMATIC NET PC Software V16 (All versions < V16 Update 6), SIMATIC NET PC Software V17 (All versions < V17 SP1), SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3 UC04), SIMATIC PCS 7 V9.1 (All versions < V9.1 SP1), SIMATIC Route Control V8.2 (All versions), SIMATIC Route Control V9.0 (All versions), SIMATIC Route Control V9.1 (All versions), SIMATIC WinCC V15 and earlier (All versions < V15 SP1 Update 7), SIMATIC WinCC V16 (All versions < V16 Update 5), SIMATIC WinCC V17 (All versions < V17 Update 2), SIMATIC WinCC V7.4 (All versions < V7.4 SP1 Update 19), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 5). When downloading files, the affected systems do not properly neutralize special elements within the pathname. An attacker could then cause the pathname to resolve to a location outside of the restricted directory on the server and read unexpected critical files.
Weakness: CWE-22
Which versions are affected by CVE-2021-40359?
It affects 5 products.
Products include Siemens Simatic Batch, Siemens Simatic Net Pc, Siemens Simatic Route Control, Siemens Simatic Wincc, Siemens Simaticpcs 7.
How do I fix CVE-2021-40359?
No fix has been published for CVE-2021-40359 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-40359 being exploited?
There is no known exploitation of CVE-2021-40359 in the wild and no public exploit code.
Other vulnerabilities in Siemens OpenPCS 7 V8.2
Sources
Also known as GHSA-6gc3-vp66-4fcm.