SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: Use After Free
CVE-2023-32233 is a high-severity use after free vulnerability in SIMATIC S7-1500 TM MFP - GNU/Linux subsystem from Siemens, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists version V1.1 as the first without the flaw, so updating SIMATIC S7-1500 TM MFP - GNU/Linux subsystem to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 13.4% chance of exploitation within 30 days, which is in the top 3.51% of all scored CVEs.
EPSS places it among the vulnerabilities most likely to be exploited soon.
What to do
- Update SIMATIC S7-1500 TM MFP - GNU/Linux subsystem to V1.1 or a later version.
- Update Linux Kernel to 4.14.315 or 4.19.283 or 5.4.243 or 5.10.180, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | before V1.1 | V1.1 |
| Linux | Linux Kernel | 3.13 up to, but not including, 4.14.315; 4.15 up to, but not including, 4.19.283; 4.20 up to, but not including, 5.4.243; 5.5 up to, but not including, 5.10.180; 5.11 up to, but not including, 5.15.111; 5.16 up to, but not including, 6.1.28; 6.2 up to, but not including, 6.2.15; 6.3 up to, but not including, 6.3.2 | 4.14.315, 4.19.283, 5.4.243, 5.10.180, 5.15.111, 6.1.28 |
| Red Hat | Enterprise Linux | 7.0; 8.0; 9.0 | Not stated |
| NetApp | Hci Baseboard Management Controller | h300s; h410c; h410s; h500s; h700s | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | NVD |
| CVSS 3.1 | 7.8 | High | CISA (ADP) |
Official description
In the Linux kernel through 6.3.1, a use-after-free in Netfilter nf_tables when processing batch requests can be abused to perform arbitrary read and write operations on kernel memory. Unprivileged local users can obtain root privileges. This occurs because anonymous sets are mishandled.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.
How developers prevent this class of flaw
- Choose a language that provides automatic memory management.
- When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095-1.htmlThird Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2196105Issue Tracking, Mitigation, Third Party Advisory
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c1592a89942e9678f7d9c8030efa777c0d57edabMailing List
- github.com/torvalds/linux/commit/c1592a89942e9678f7d9c8030efa777c0d57edab
- openwall.com/lists/oss-security/2023/05/08/4Mailing List, Third Party Advisory
Third-party and government advisories
- openwall.com/lists/oss-security/2023/05/15/5Mailing List, Third Party Advisory
- lists.debian.org/debian-lts-announce/2023/06/msg00008.htmlThird Party Advisory
- lists.debian.org/debian-lts-announce/2023/07/msg00030.htmlMailing List, Third Party Advisory
- security.netapp.com/advisory/ntap-20230616-0002/Mailing List, Third Party Advisory
- debian.org/security/2023/dsa-5402Mailing List, Third Party Advisory
Other references
Other vulnerabilities in SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- 7.8 High severity
- 7.8 High severity
Linux Kernel Unspecified Exploited
- 8.8 High severity
- 7.8 High severity
- 8.8 High severity
- 8.2 High severity
Recent Use After Free vulnerabilities
- 7.8 High severity
- 8.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 8.8 High severity
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