CVE-2017-7805
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Mozilla Firefox
PublishedJun 11, 2018
First seenJun 11, 2018
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | 52.4.0, 56.0 | — |
| mozilla thunderbird | 52.4.0 | — |
| debian debian_linux | 7.0, 8.0, 9.0 | — |
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