Not rated
CVE-2017-7805 During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 56 | earliest → < 56 | 56 |
| Firefox ESR 52.4 | earliest → < 52.4 | 52.4 |
| Thunderbird 52.4 | earliest → < 52.4 | 52.4 |
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