| Name | CVE-2019-6706 |
| Description | Lua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c. For example, a crash outcome might be achieved by an attacker who is able to trigger a debug.upvaluejoin call in which the arguments have certain relationships. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 920321 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| lua5.1 (PTS) | buster, bullseye | 5.1.5-8.1 | fixed |
| bookworm, sid | 5.1.5-9 | fixed |
| lua5.2 (PTS) | buster, bullseye | 5.2.4-1.1 | fixed |
| bookworm, sid | 5.2.4-3 | fixed |
| lua5.3 (PTS) | buster, bullseye | 5.3.3-1.1 | vulnerable |
| bookworm, sid | 5.3.6-2 | fixed |
| lua50 (PTS) | buster | 5.0.3-8 | fixed |
| bullseye | 5.0.3-8.1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| lua5.1 | source | (unstable) | (not affected) | | | |
| lua5.2 | source | (unstable) | (not affected) | | | |
| lua5.3 | source | (unstable) | 5.3.6-1 | | | 920321 |
| lua50 | source | (unstable) | (not affected) | | | |
Notes
[bullseye] - lua5.3 <postponed> (Minor issue, revisit when fixed upstream)
[buster] - lua5.3 <postponed> (Minor issue, revisit when fixed upstream)
[stretch] - lua5.3 <postponed> (Minor issue, revisit when fixed upstream)
- lua5.2 <not-affected> (Vulnerable code introduced later)
- lua5.1 <not-affected> (Vulnerable code introduced later)
- lua50 <not-affected> (Vulnerable code introduced later)
http://lua.2524044.n2.nabble.com/Bug-Report-Use-after-free-in-debug-upvaluejoin-tc7685506.html
lua50 and lua5.1 don't have the affected code.
lua5.2 is not vulnerable as it doesn't free the value before using it.