---
id: CVE-2017-7549
aliases:
  - GHSA-53wm-97p6-582f
  - PYSEC-2017-152
  - PYSEC-2026-645
title: instack-undercloud vulnerable to symlink attack on tmp files
summary: instack-undercloud vulnerable to symlink attack on tmp files
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N'
vendor: instack-undercloud
product: instack-undercloud
ecosystem: pip
affected:
  - instack-undercloud <= 7.2.0
published: '2022-05-13'
updated: '2026-07-06'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-53wm-97p6-582f'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2017-7549'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2557'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2649'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2687'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2693'
  - url: 'https://access.redhat.com/errata/RHSA-2017:2726'
  - url: 'https://access.redhat.com/security/cve/CVE-2017-7549'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1477403'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/instack/PYSEC-2017-152.yaml
  - url: 'https://opendev.org/openstack/instack-undercloud'
  - url: >-
      https://web.archive.org/web/20170907040549/http://www.securityfocus.com/bid/100407
  - url: 'http://www.securityfocus.com/bid/100407'
tags:
  - osv
  - pip
epss: 0.00356
epssPercentile: 0.29263
ingestedAt: '2026-07-08T18:25:45.754Z'
---

## Overview

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.

## Affected packages

- `instack-undercloud <= 7.2.0`

## Remediation

Refer to the advisory for the patched release.