CVE-2017-7805
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.
Routine
CVSS
n/a
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0305
87th percentile
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 |