CVE-2017-7805

MEDIUM

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.

References

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/

Details

Source: MITRE

Published: 2018-06-11

Updated: 2018-10-17

Type: CWE-416

Risk Information

CVSS v2.0

Base Score: 5

Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 7.5

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

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH