Use After Free in Lua
CVE-2019-6706
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.172 (97.0th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.172 · newest: 0.172 · change: 0.000
Affected products
- Lua — versions 5.3.5
- Canonical Ubuntu Linux — versions 16.04, 18.04, 18.10
Weakness classification (CWE)
Public proof-of-concept exploits
References
- packetstormsecurity.com/files/151335/Lua-5.3.5-Use-After-Free.html (Exploit, VDB Entry, Third Party Advisory)
- github.com/Lua-Project/cve-analysis/blob/a43c9ccd00274b31fa2f24c6c8f20ce3665568… (Exploit, Third Party Advisory)
- github.com/lua/lua/commit/89aee84cbc9224f638f3b7951b306d2ee8ecb71e (Patch, Third Party Advisory)
- lua-users.org/lists/lua-l/2019-01/msg00039.html (Broken Link)
- access.redhat.com/security/cve/cve-2019-6706 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/06/msg00031.html (mailing-list)
Frequently asked questions
- What is CVE-2019-6706?
- CVE-2019-6706 is a high-severity vulnerability in Lua, classified under Use After Free. CVSS score: 7.5/10. Published 2019-01-23.
- How severe is CVE-2019-6706?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-6706 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.