Out-of-bounds read in Mozilla Firefox and Firefox ESR - CVE-2020-6806

Detailed vulnerability description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to an out-of-bounds read error due to BodyStream::OnInputStreamReady was missing protections against state confusion. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

How to mitigate CVE-2020-6806

Sources

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-08/
• https://www.mozilla.org/en-US/security/advisories/mfsa2020-09/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1612308