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MFSA2017-22 Firefox: Security vulnerabilities fixed in Firefox ESR 52.4 (CVE-2017-7805)

Severity CVSS Published Added Modified
4 (AV:L/AC:M/Au:N/C:P/I:P/A:P) September 28, 2017 September 29, 2017 December 05, 2017

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.

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References

Solution

mozilla-firefox-esr-upgrade-52_4

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