Security readout for executives and security teams
Plain-English summary
ZKTeco BioTime versions 8.5.5 through 9.x before build 9.0.1 (20240617.19506) can let an attacker abuse SFTP settings handling to create or overwrite server files. In the worst case, this can lead to full system-level code execution on the BioTime server.
Executive priority
Treat this as urgent if BioTime is deployed. The worst-case impact is complete server compromise, but the provided bundle does not prove active exploitation. Prioritize patch verification and access restriction.
Technical view
The issue is described as path traversal in the Username field plus missing sanitization of the SSH Key field on /base/sftpsetting/ endpoints. The source text says authenticated attackers can create or overwrite arbitrary files; the CVSS vector lists PR:N, so privilege requirements are inconsistent across metadata.
Likely exposure
Organizations running ZKTeco BioTime 8.5.5 through affected 9.x builds are the relevant population. Exposure is higher where BioTime is reachable from untrusted networks or where low-trust users can access SFTP settings.
Exploitation context
The bundle includes public exploit-related references, including PacketStorm via Sploitus and a GitHub repository. It does not state confirmed active exploitation, and CISA KEV status is false in the provided data.
Researcher notes
Do not assume unauthenticated reachability without reconciling the source conflict between the description and CVSS vector. Focus validation on affected build identification, access paths to SFTP settings, and evidence of arbitrary file writes.
Mitigation direction
- Upgrade BioTime to 9.0.1 (20240617.19506) or a vendor-confirmed fixed build.
- Check ZKTeco download and announcement pages for current vendor guidance.
- Restrict BioTime administrative access to trusted networks and authorized users.
- Audit accounts with access to SFTP settings and remove unnecessary privileges.
- Monitor the BioTime server for unexpected file creation or overwrites.
Validation and detection
- Inventory all BioTime instances and record exact version and build numbers.
- Confirm no instance runs 8.5.5 through 9.x before 9.0.1 (20240617.19506).
- Review application logs for unusual /base/sftpsetting/ activity.
- Review server file integrity alerts around BioTime application and service paths.
- Verify remediation against vendor release information, not only package names.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-38951 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://claroty.com/team82/disclosure-dashboard/cve-2023-38951CVE reference, mitre
- https://github.com/omair2084/biotime-rce-8.5.5/blob/main/biotime_enum.pyCVE reference, mitre
- https://krashconsulting.com/fury-of-fingers-biotime-rce/CVE reference, mitre
- https://www.zkteco.com/en/ZKBio_Time/ZKBioTime#DownloadCVE reference, mitre
- https://www.zkteco.com/en/announcementCVE reference, mitre
- https://sploitus.com/exploit?id=PACKETSTORM:177859CVE reference, CISA-ADP · exploit
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.