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CVE-2017-7805

Published: 29 September 2017

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
upstream
Released (56.0)
xenial
Released (56.0+build6-0ubuntu0.16.04.1)
zesty
Released (56.0+build6-0ubuntu0.17.04.1)
artful
Released (56.0+build6-0ubuntu1)
bionic
Released (56.0+build6-0ubuntu1)
cosmic
Released (56.0+build6-0ubuntu1)
trusty
Released (56.0+build6-0ubuntu0.14.04.1)
thunderbird
Launchpad, Ubuntu, Debian
upstream
Released (52.4.0)
xenial
Released (1:52.4.0+build1-0ubuntu0.16.04.2)
zesty
Released (1:52.4.0+build1-0ubuntu0.17.04.2)
artful
Released (1:52.4.0+build1-0ubuntu2)
bionic
Released (1:52.4.0+build1-0ubuntu2)
cosmic
Released (1:52.4.0+build1-0ubuntu2)
trusty
Released (1:52.4.0+build1-0ubuntu0.14.04.2)
nss
Launchpad, Ubuntu, Debian
upstream Needs triage

trusty
Released (2:3.28.4-0ubuntu0.14.04.3)
xenial
Released (2:3.28.4-0ubuntu0.16.04.3)
zesty
Released (2:3.28.4-0ubuntu0.17.04.3)
artful
Released (2:3.32-1ubuntu3)
bionic
Released (2:3.32-1ubuntu3)
cosmic
Released (2:3.32-1ubuntu3)
Patches:
upstream: https://hg.mozilla.org/projects/nss/rev/839200ce0943166a079284bdf45dcc37bb672925

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H