Security readout for executives and security teams
Plain-English summary
Spinnaker could unpack deployment TAR files in a way that lets paths escape the intended directory. In affected AppEngine deployment workflows, this could overwrite files inside the container and disrupt delivery infrastructure or potentially alter runtime behavior.
Executive priority
Treat as a moderate-priority CI/CD platform issue. It affects deployment integrity and could cause high availability impact, but current sources do not show public active exploitation.
Technical view
CWE-22 path traversal in Spinnaker AppEngine TAR handling. The local extraction utility did not validate archive paths before deployment, creating a file overwrite risk on the container. Sources describe possible library replacement or wrapper-file injection impacts.
Likely exposure
Exposure is likely for Spinnaker versions >=1.26.0 and <1.26.7, >=1.25.0 and <1.25.7, or <1.24.7 when Google AppEngine deployments or TAR-provided artifacts are enabled.
Exploitation context
The CVSS vector requires local access and low privileges. The provided sources do not report active exploitation, and CISA KEV is not indicated. Practical risk depends on who can submit or influence TAR artifacts used in AppEngine deployments.
Researcher notes
Key scoping questions are version, AppEngine deployment usage, and TAR artifact trust boundaries. The advisory names update and feature-disabling mitigations but does not provide exploit evidence in the supplied bundle.
Mitigation direction
- Upgrade Spinnaker to a version outside the affected ranges.
- If unable to update, disable Google AppEngine deployments.
- If unable to update, disable artifacts that provide TAR files.
- Restrict who can create or modify deployment artifacts.
- Check vendor advisory for any environment-specific guidance.
Validation and detection
- Inventory Spinnaker versions across all deployment environments.
- Confirm whether Google AppEngine deployments are enabled.
- Confirm whether TAR-provided artifacts are accepted.
- Review recent AppEngine deployments for unexpected artifacts or sources.
- Verify upgraded instances are no longer in affected version ranges.
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 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 lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-39143 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
- Medium
- CVSS
- 6.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/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.
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:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H1.84.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.6MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/spinnaker/spinnaker/security/advisories/GHSA-34jx-3vmr-56v8CVE reference · x_refsource_CONFIRM
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.