instack-undercloud vulnerable to symlink attack on tmp files
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | instack | <= 7.2.0, <= 6.1.0, <= 5.3.0 | no fix |
| Python (PyPI) | instack-undercloud | <= 7.2.0 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2017-7549
- https://access.redhat.com/errata/RHSA-2017:2557
- https://access.redhat.com/errata/RHSA-2017:2649
- https://access.redhat.com/errata/RHSA-2017:2687
- https://access.redhat.com/errata/RHSA-2017:2693
- https://access.redhat.com/errata/RHSA-2017:2726
- https://access.redhat.com/security/cve/CVE-2017-7549
- https://bugzilla.redhat.com/show_bug.cgi?id=1477403
- https://github.com/pypa/advisory-database/tree/main/vulns/instack/PYSEC-2017-152.yaml
- https://opendev.org/openstack/instack-undercloud
- https://web.archive.org/web/20170907040549/http://www.securityfocus.com/bid/100407
- http://www.securityfocus.com/bid/100407
- https://pypi.org/project/instack-undercloud
- https://github.com/advisories/GHSA-53wm-97p6-582f
- CVSS vector
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N- Weakness (CWE)
CWE-377, CWE-59- Platform
- Python (PyPI)
- Package
instack, instack-undercloud- Disclosed
- 21.09.2017
- Updated
- 11.10.2026 13:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2017-152 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-53wm-97p6-582f - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-645 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: instack-undercloud
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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