Buffer overflow in Lua - CVE-2020-24342

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a stack redzone cross in luaO_pushvfstring because a protection mechanism wrongly calls luaD_callnoyield twice in a row. A remote attacker can pass specially crafted data to the application, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Affected software

How to mitigate CVE-2020-24342

External References

• http://lua-users.org/lists/lua-l/2020-07/msg00052.html
• https://github.com/lua/lua/commit/34affe7a63fc5d842580a9f23616d057e17dfe27

Related Security Bulletins

• Multiple vulnerabilities in Lua
• Fedora 33 update for lua