CVE-2019-6706 — Lua 5
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.
Published
2019-01-23T00:00:00.000Z
Last modified
2024-08-04T20:31:04.249Z
01What is this vulnerability?
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.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2019-01-23T00:00:00.000Z
- Last modified: 2024-08-04T20:31:04.249Z
09References
- packetstormsecurity.com — http://packetstormsecurity.com/files/151335/Lua-5.3.5-Use-After-Free.html
- github.com — https://github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce…
- github.com — https://github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e
- lua-users.org — http://lua-users.org/lists/lua-l/2019-01/msg00039.html
- access.redhat.com — https://access.redhat.com/security/cve/cve-2019-6706
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/06/msg00031.html
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