GHSA-cpcw-p965-wpqx is a high-severity (CVSS 7.8) Incorrect Default Permissions vulnerability in rtslib-fb. A fix is available for rtslib-fb — see the affected versions and patch details below.
rtslib-fb weak permissions for /etc/target/saveconfig.json file
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-cpcw-p965-wpqx plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 376,715 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
rtslib-fbReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Python rtslib-fb through 2.1.72 has weak permissions for /etc/target/saveconfig.json because shutil.copyfile (instead of shutil.copy) is used, and thus permissions are not preserved.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | rtslib-fb | all versions | 2.1.73pip install --upgrade 'rtslib-fb==2.1.73' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rtslib-fb, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update rtslib-fb to 2.1.73 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-cpcw-p965-wpqx is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-cpcw-p965-wpqx can be triaged on real exposure rather than presence alone.
Tailored to GHSA-cpcw-p965-wpqx. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Red Hat Ceph Storage 2 and 3 are not affected because within the affected method, shutil.copyfile is not used. However, the affected method, save_to_file is outdated and contains a race condition. Hence, this issue has been rated as having a security impact of low.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Enterprise Linux 7 | python-rtslib-0:2.1.74-1.el7_9 | RHSA-2020:5435 |
| Red Hat Enterprise Linux 8 | python-rtslib-0:2.1.73-2.el8 | RHEA-2020:4505 |
Frequently Asked Questions
Is GHSA-cpcw-p965-wpqx in your dependencies?
O3 Security finds GHSA-cpcw-p965-wpqx across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.