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CVE-2020-24342

Published: 13 August 2020

Lua through 5.4.0 allows a stack redzone cross in luaO_pushvfstring because a protection mechanism wrongly calls luaD_callnoyield twice in a row.

Notes

AuthorNote
mdeslaur
couldn't reproduce on lua earlier than 5.4, and problematic code
doesn't seem present. Marking as not-affected.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
lua5.1
Launchpad, Ubuntu, Debian
impish Not vulnerable
(code not present)
hirsute Not vulnerable
(code not present)
upstream Needs triage

bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
groovy Not vulnerable
(code not present)
trusty Not vulnerable
(code not present)
xenial Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
lua5.2
Launchpad, Ubuntu, Debian
impish Not vulnerable
(code not present)
hirsute Not vulnerable
(code not present)
upstream Needs triage

bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
groovy Not vulnerable
(code not present)
trusty Not vulnerable
(code not present)
xenial Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
lua5.3
Launchpad, Ubuntu, Debian
impish Not vulnerable
(code not present)
trusty Does not exist

upstream Needs triage

bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
groovy Not vulnerable
(code not present)
hirsute Not vulnerable
(code not present)
jammy Not vulnerable
(code not present)
xenial Not vulnerable
(code not present)
lua5.4
Launchpad, Ubuntu, Debian
impish Not vulnerable
(5.4.1-1)
hirsute Not vulnerable
(5.4.1-1)
bionic Does not exist

focal Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

groovy Ignored
(end of life)
jammy Not vulnerable
(5.4.1-1)
Patches:
upstream: https://github.com/lua/lua/commit/34affe7a63fc5d842580a9f23616d057e17dfe27
lua50
Launchpad, Ubuntu, Debian
impish Not vulnerable
(code not present)
trusty Does not exist

upstream Needs triage

bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
groovy Not vulnerable
(code not present)
hirsute Not vulnerable
(code not present)
jammy Does not exist

xenial Not vulnerable
(code not present)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H