CVE-2020-15945

Summary

Lua 5.4.0 (fixed in 5.4.1) has a segmentation fault in changedline in ldebug.c (e.g., when called by luaG_traceexec) because it incorrectly expects that an oldpc value is always updated upon a return of the flow of control to a function.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://github.com/lua/lua/commit/a2195644d89812e5b157ce7bac35543e06db05e3 ↗

Additional information

• NVD record
• https://github.com/lua/lua/commit/a2195644d89812e5b157ce7bac35543e06db05e3Patch
• https://www.lua.org/bugs.html#5.4.0-8
• http://lua-users.org/lists/lua-l/2020-07/msg00123.htmlAdvisory