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Rewterz Threat Advisory – Multiple Vulnerabilities in Firefox Exploited in the Wild

Severity

High

Analysis Summary

CVE-2020-6819

This bug is a use-after free vulnerability tied to the browser component “nsDocShell destructor”.  The Firefox nsDocShell is a client of the nsI-HttpChannel API, a function of the browser related to reading HTTP headers.

CVE-2020-6820

The attackers are targeting the Firefox browser component ReadableStream, an interface of the Streams API. The Streams API is “responsible for breaking a resource that you want to receive over a network down into small chunks,”

These vulnerabilities are currently being exploited in the wild.

Impact

Arbitrary code execution

Affected Vendors

Mozilla

Affected Products

  • Firefox
  • Firefox ESR

Remediation

Update to fixed versions.

Firefox 74.0.1 and Firefox ESR 68.6.1

https://support.mozilla.org/en-US/kb/update-firefox-latest-release