CVE-2017-7805
This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.11%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 3.11% probability · 87th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- mozilla/firefox · mozilla/thunderbird · debian/debian linux
- Source
- security@mozilla.org
References
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://www.securityfocus.com/bid/101059Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039465Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:2832Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1377618Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2017/11/msg00000.htmlThird Party Advisory
- https://security.gentoo.org/glsa/201803-14Third Party Advisory
- https://www.debian.org/security/2017/dsa-3987Third Party Advisory
- https://www.debian.org/security/2017/dsa-3998Third Party Advisory
- https://www.debian.org/security/2017/dsa-4014Third 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
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- http://www.securityfocus.com/bid/101059Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039465Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:2832Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1377618Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2017/11/msg00000.htmlThird Party Advisory
- https://security.gentoo.org/glsa/201803-14Third Party Advisory
- https://www.debian.org/security/2017/dsa-3987Third Party Advisory
- https://www.debian.org/security/2017/dsa-3998Third Party Advisory
- https://www.debian.org/security/2017/dsa-4014Third 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.