firefox: During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer
CVE-2017-7805 is fixed in 14 products on 1 platform, first by libnss3 2:3.32-1ubuntu3, released September 28, 2017. It is not reported as exploited. Patch Radar priority: Routine.
During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but in some cases, the handshake transcript can exceed the space available in the current buffer, causing the allocation of a new buffer. This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards. This can result in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| firefox · Ubuntu 18.04.6 LTS (bionic) | 56.0+build6-0ubuntu1 | firefox 56.0+build6-0ubuntu1 | Oct 1, 2017 |
| firefox-globalmenu · Ubuntu 18.04.6 LTS (bionic) | 56.0+build6-0ubuntu1 | firefox-globalmenu 56.0+build6-0ubuntu1 | Oct 1, 2017 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 56.0+build6-0ubuntu1 | firefox-mozsymbols 56.0+build6-0ubuntu1 | Oct 1, 2017 |
| firefox-testsuite · Ubuntu 18.04.6 LTS (bionic) | 56.0+build6-0ubuntu1 | firefox-testsuite 56.0+build6-0ubuntu1 | Oct 1, 2017 |
| libnss3 · Ubuntu 18.04.6 LTS (bionic) | 2:3.32-1ubuntu3 | libnss3 2:3.32-1ubuntu3 | Sep 28, 2017 |
| libnss3-tools · Ubuntu 18.04.6 LTS (bionic) | 2:3.32-1ubuntu3 | libnss3-tools 2:3.32-1ubuntu3 | Sep 28, 2017 |
| thunderbird · Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | thunderbird 1:52.4.0+build1-0ubuntu2 | Oct 1, 2017 |
| thunderbird-globalmenu · Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | thunderbird-globalmenu 1:52.4.0+build1-0ubuntu2 | Oct 1, 2017 |
| thunderbird-gnome-support · Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | thunderbird-gnome-support 1:52.4.0+build1-0ubuntu2 | Oct 1, 2017 |
| thunderbird-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | thunderbird-mozsymbols 1:52.4.0+build1-0ubuntu2 | Oct 1, 2017 |
| thunderbird-testsuite · Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | thunderbird-testsuite 1:52.4.0+build1-0ubuntu2 | Oct 1, 2017 |
| xul-ext-calendar-timezones · Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | xul-ext-calendar-timezones 1:52.4.0+build1-0ubuntu2 | Oct 1, 2017 |
| xul-ext-gdata-provider · Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | xul-ext-gdata-provider 1:52.4.0+build1-0ubuntu2 | Oct 1, 2017 |
| xul-ext-lightning · Ubuntu 18.04.6 LTS (bionic) | 1:52.4.0+build1-0ubuntu2 | xul-ext-lightning 1:52.4.0+build1-0ubuntu2 | Oct 1, 2017 |
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