CVEs-PoC/2017/CVE-2017-7805.md

### [CVE-2017-7805](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7805)
![](https://img.shields.io/static/v1?label=Product&message=Firefox%20ESR&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Thunderbird&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2052.4%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2056%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Use-after-free%20in%20TLS%201.2%20generating%20handshake%20hashes&color=brighgreen)

### 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.

### POC

#### Reference
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html

#### Github
No PoCs found on GitHub currently.