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.
The product reads data past the end, or before the beginning, of the intended buffer.
| Link | Tags |
|---|---|
| https://www.mozilla.org/security/advisories/mfsa2020-08/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-10/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-09/ | vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1612308 | issue tracking permissions required |
| https://usn.ubuntu.com/4328-1/ | third party advisory vendor advisory |
| https://usn.ubuntu.com/4335-1/ | third party advisory vendor advisory |
| http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.html | vdb entry third party advisory |