CVE-2020-6806

Summary

By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

Affected Software

Weaknesses

• BodyStream::OnInputStreamReady was missing protections against state confusion

ADP Enrichment

CVE Program Container

Additional References

• https://www.mozilla.org/security/advisories/mfsa2020-08/
• https://www.mozilla.org/security/advisories/mfsa2020-10/
• https://www.mozilla.org/security/advisories/mfsa2020-09/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1612308
• https://usn.ubuntu.com/4328-1/
• https://usn.ubuntu.com/4335-1/
• http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.html

References

• https://www.mozilla.org/security/advisories/mfsa2020-08/
• https://www.mozilla.org/security/advisories/mfsa2020-10/
• https://www.mozilla.org/security/advisories/mfsa2020-09/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1612308
• https://usn.ubuntu.com/4328-1/
• https://usn.ubuntu.com/4335-1/
• http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.html

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