Type Confusion in Lua - CVE-2021-44647

Vulnerability identifier: #VU75704

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-44647

CWE-ID: CWE-843

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a type confusion error within the funcnamefromcode() function in ldebug.c. A remote attacker can pass specially crafted data to the application, trigger a type confusion error and perform a denial of service (DoS) attack.

Lua
Gentoo Linux
openEuler
Fedora
lua
lua-debuginfo
lua-debugsource
lua-devel
lua-help

Install updates from vendor's website.

Lua - update to 5.4.4
lua - addressed in versions 5.4.3-4.fc34, 5.4.3-4.fc35, 5.4.4-1.fc34
lua - update to 5.4.3-6
lua-debuginfo - update to 5.4.3-6
lua-debugsource - update to 5.4.3-6
lua-devel - update to 5.4.3-6
lua-help - update to 5.4.3-6

• http://lua-users.org/lists/lua-l/2021-11/msg00204.html
• http://lua-users.org/lists/lua-l/2021-11/msg00195.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/P3EMGAQ5Y6GXJLY4K5DUOOEQT4MZ4J4F/
• https://access.redhat.com/security/cve/cve-2021-44647

• Denial of service in Lua interpreter
• Gentoo update for Lua
• openEuler 22.03 LTS update for lua
• Fedora 35 update for lua
• Fedora 34 update for lua
• Fedora 34 update for lua