CVE-2017-7805 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html http://www.securityfocus.com/bid/101059 http://www.securitytracker.com/id/1039465 https://access.redhat.com/errata/RHSA-2017:2832 https://bugzilla.mozilla.org/show_bug.cgi?id=1377618 https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html https://security.gentoo.org/glsa/201803-14 https://www.debian.org/security/2017/dsa-3987 https://www.debian.org/security/2017/dsa-3998 https://www.debian.org/security/2017/dsa-4014 https://www.mozilla.org/security/advisories/mfsa2017-21/ https://www.mozilla.org/security/advisories/mfsa2017-22/ https://www.mozilla.org/security/advisories/mfsa2017-23/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5