Link following in Red Hat instack-undercloud
Priority LOW 28CWE-377Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · Low · None
- Fix status
- Partial Red Hat: 5 fixed, 4 without a fix
Attack profile from CVSS 3.0 · NVD. Fix status from CNA, GitHub and Red Hat.
Summary
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.
Why it matters now
EPSS 0.0035 28th percentileScored 2026-11-07
Fix Partial Red Hat: 5 advisoriesRed Hat: 5 fixed, 4 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Red Hat | instack-undercloud | Pike, 12: v7.2.0, Ocata, 11: v6.1.0, Newton, 10: v5.3.0 | — | No fix listed | CNA |
| — | instack-undercloud (PyPI) | up to 7.2.0 | — | No fix listed | GHSA-53wm-97p6-582f |
- instack-undercloud VendorRed Hat Affected Pike, 12: v7.2.0, Ocata, 11: v6.1.0, Newton, 10: v5.3.0 Fixed in — No fix listed CNA
- instack-undercloud (PyPI) Vendor— Affected up to 7.2.0 Fixed in — No fix listed GHSA-53wm-97p6-582f
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openstack:instack-undercloud:7.2.0:*:*:*:*:*:*:* | 7.2.0 | Vulnerable | OpenStack |
| cpe:2.3:a:redhat:openstack:12:*:*:*:*:*:*:* | 12 | Running on | Red Hat |
| cpe:2.3:a:openstack:instack-undercloud:6.1.0:*:*:*:*:*:*:* | 6.1.0 | Vulnerable | OpenStack |
| cpe:2.3:a:redhat:openstack:11:*:*:*:*:*:*:* | 11 | Running on | Red Hat |
| cpe:2.3:a:openstack:instack-undercloud:5.3.0:*:*:*:*:*:*:* | 5.3.0 | Vulnerable | OpenStack |
| cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:* | 10 | Running on | Red Hat |
- cpe:2.3:a:openstack:instack-undercloud:7.2.0:*:*:*:*:*:*:* Versions 7.2.0 Vulnerable ·OpenStack
- cpe:2.3:a:redhat:openstack:12:*:*:*:*:*:*:* Versions 12 Running on ·Red Hat
- cpe:2.3:a:openstack:instack-undercloud:6.1.0:*:*:*:*:*:*:* Versions 6.1.0 Vulnerable ·OpenStack
- cpe:2.3:a:redhat:openstack:11:*:*:*:*:*:*:* Versions 11 Running on ·Red Hat
- cpe:2.3:a:openstack:instack-undercloud:5.3.0:*:*:*:*:*:*:* Versions 5.3.0 Vulnerable ·OpenStack
- cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:* Versions 10 Running on ·Red Hat
Remediation
Red Hat 5 advisories
- RHSA-2017:2726 Released 2017-09-13 · Red Hat rating Moderateinstack-undercloud security, bug fix, and enhancement update
- Red Hat OpenStack Platform 11.0 instack-undercloud-6.1.0-3.el7ost
- RHSA-2017:2687 Released 2017-09-12 · Red Hat rating Moderateinstack-undercloud security update
- OpenStack 8.0 Director for RHEL 7 instack-undercloud-2.2.7-10.el7ost
- RHSA-2017:2693 Released 2017-09-12 · Red Hat rating Moderateinstack-undercloud security update
- OpenStack 7.0 Director for RHEL 7 instack-undercloud-2.1.2-41.el7ost
Show 2 more Red Hat advisories
- RHSA-2017:2649 Released 2017-09-06 · Red Hat rating Moderateinstack-undercloud security, bug fix, and enhancement update
- Red Hat OpenStack Platform 10.0 instack-undercloud-5.3.0-3.el7ost
- RHSA-2017:2557 Released 2017-08-30 · Red Hat rating Moderateinstack-undercloud security update
- OpenStack 9.0 Director for RHEL 7 instack-undercloud-4.0.0-17.el7ost
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux OpenStack Platform 6 (Juno) | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) | Affected | No fix yet |
| Red Hat OpenStack Platform 8 (Liberty) | Affected | No fix yet |
| Red Hat OpenStack Platform 9 (Mitaka) | Affected | No fix yet |
| OpenStack 7.0 Director for RHEL 7 | Fixed | RHSA-2017:2693 |
| OpenStack 8.0 Director for RHEL 7 | Fixed | RHSA-2017:2687 |
| OpenStack 9.0 Director for RHEL 7 | Fixed | RHSA-2017:2557 |
| Red Hat OpenStack Platform 10.0 | Fixed | RHSA-2017:2649 |
| Red Hat OpenStack Platform 11.0 | Fixed | RHSA-2017:2726 |
Not affected: 1 product
- Red Hat OpenStack Platform 12 (Pike)
Timeline
- 2026-10-02 Threatist record created from CVE-2017-7549
- 2026-10-03 Alias added: GHSA-53wm-97p6-582f
References
Advisory 7
More Red Hat vulnerabilities
- TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
- TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
- TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
- TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
- TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
- TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
Sources
- CVE-2017-7549 · CVE Program
- CVE-2017-7549 · NVD
- FIRST EPSS
- GHSA-53wm-97p6-582f · GitHub Advisory Database · CC BY 4.0
- CVE-2017-7549 · Red Hat security data · CC BY 4.0
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