National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2017-7805 Detail

Current 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.

Source:  MITRE
Description Last Modified:  06/11/2018
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.5 HIGH
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (V3 legend)
Impact Score: 3.6
Exploitability Score: 3.9


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 5.0 MEDIUM
Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 10.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Partial
Additional Information:
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.securityfocus.com/bid/101059 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1039465 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2017:2832 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1377618 Issue Tracking Vendor Advisory
https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html Third Party Advisory
https://security.gentoo.org/glsa/201803-14 Third Party Advisory
https://www.debian.org/security/2017/dsa-3987 Third Party Advisory
https://www.debian.org/security/2017/dsa-3998 Third Party Advisory
https://www.debian.org/security/2017/dsa-4014 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2017-21/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-22/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-23/ Vendor Advisory

Technical Details

Vulnerability Type (View All)

Change History

2 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-7805
NVD Published Date:
06/11/2018
NVD Last Modified:
08/02/2018