Vulnerability Details CVE-2017-7805
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.048
EPSS Ranking 89.1%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
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/
- 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/
Products affected by CVE-2017-7805
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cpe:2.3:a:mozilla:firefox:52.4.0
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cpe:2.3:a:mozilla:firefox:56.0
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cpe:2.3:a:mozilla:thunderbird:52.4.0
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cpe:2.3:o:debian:debian_linux:7.0
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cpe:2.3:o:debian:debian_linux:8.0
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cpe:2.3:o:debian:debian_linux:9.0