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Not in CISA KEV
MEDIUM severity

CVE-2021-28100

MEDIUM

CVE-2021-28100 is a medium-severity (CVSS 6.2) vulnerability in com.netflix.priam:priam. O3 Security confirms whether CVE-2021-28100 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Netflix/Priam: Temporary Directory Information Disclosure

Published
Mar 30, 2021
Updated
Nov 8, 2023
Affected
1 pkg
Patched
None yet
Exploits
None indexed
Exploitation data as of Nov 8, 2023 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
☕com.netflix.priam:priam

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Impact

When File.createTempFile creates a file, the permissions on that file are -rw-r--r--. This means that other users can read the contents of these files after they are written, although they can not modify the contents. This allows for local information disclosure if these files contain sensitive information.

Vulnerable locations:

The custom CodeQL queries leveraged to find these this as well as their results can be found here:

https://lgtm.com/query/1543383251073929777/ https://lgtm.com/query/3142895023158674709/

Official Disclosure

https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-002.md

Fix

There are no fixed versions.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
☕Mavencom.netflix.priam:priamall versionsNo fix

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.netflix.priam:priam. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Remediation status

    No patched version of com.netflix.priam:priam has shipped for CVE-2021-28100 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    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.

  4. How O3 protects you

    O3 pinpoints whether CVE-2021-28100 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2021-28100. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

### Impact When `File.createTempFile` creates a file, the permissions on that file are -rw-r--r--. This means that other users can read the contents of these files after they are written, although they can not modify the contents. This allows for local information disclosure if these files contain sensitive information. Vulnerable locations: - https://github.com/Netflix/Priam/blob/362660bb7ebddb0cfa756a282d94678f65af9f06/priam/src/main/java/com/netflix/priam/backup/MetaData.java#L106-L111 - https://github.com/Netflix/Priam/blob/362660bb7ebddb0cfa756a282d94678f65af9f06/priam/src/main/java/c
O3 Security · Impact-Aware SCA

Is CVE-2021-28100 in your dependencies?

O3 detects CVE-2021-28100 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works