CVE-2017-7805

CVE Details

Release Date:	2018-06-11
Impact:	None	What is this?

Description

During TLS 1.2 exchanges, handshake hashes are generated which pointto 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.

See more information about CVE-2017-7805 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v2 metrics

Base Score:	5.0
Vector String:	AV:N/AC:L/Au:N/C:N/I:N/A:P
Version:	2.0
Attack Vector:	Network
Attack Complexity:	Low
Authentication:	None
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	Partial

Errata information

Platform	Errata	Release Date
Oracle Linux version 6 (nss)	ELSA-2017-2832	2017-09-28
Oracle Linux version 7 (nss)	ELSA-2017-2832	2017-09-28
Oracle VM version 3.3 (nss)	OVMSA-2017-0154	2017-09-29
Oracle VM version 3.3 (nss)	OVMSA-2017-0156	2017-09-29
Oracle VM version 3.4 (nss)	OVMSA-2017-0154	2017-09-29
Oracle VM version 3.4 (nss)	OVMSA-2017-0156	2017-09-29