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Medium, CVSS 6.4amended

instack-undercloud vulnerable to symlink attack on tmp files

CVE-2017-7549GHSA-53wm-97p6-582f

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI instack-undercloud

    Affected
    <= 7.2.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.4 · CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
EPSS
  • CVE-2017-7549: 0.35% estimated exploitation activity in the next 30 days; percentile 28.67 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

A flaw was found in instack-undercloud 7.2.0 as packaged in Red Hat OpenStack Platform Pike, 6.1.0 as packaged in Red Hat OpenStack Platform Oacta, 5.3.0 as packaged in Red Hat OpenStack Newton, where pre-install and security policy scripts used insecure temporary files. A local user could exploit this flaw to conduct a symbolic-link attack, allowing them to overwrite the contents of arbitrary files.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-53wm-97p6-582f

  2. Revision 1 · created ·

    Published from osv record GHSA-53wm-97p6-582f

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2017-7549

Advisory: instack-undercloud vulnerable to symlink attack on tmp files
IDs: CVE-2017-7549, GHSA-53wm-97p6-582f
Record: https://patchnext.com/advisories/cve-2017-7549 (revision 2, source checked 26 Oct 2026, 13:42 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI instack-undercloud: affected <= 7.2.0

## Suggested inspection (read-only)
- `python -m pip show instack-undercloud`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on instack-undercloud.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-53wm-97p6-582f (OSV record GHSA-53wm-97p6-582f lists affected ranges: PyPI instack-undercloud >=0 <=7.2.0)
- Verified: https://github.com/advisories/GHSA-53wm-97p6-582f (GitHub-reviewed advisory GHSA-53wm-97p6-582f lists affected ranges: PyPI instack-undercloud >=0 <=7.2.0)

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