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» GHSA-3933-wvjf-pcvc
Description
An embedding using affected versions of lucet-runtime configured to use non-default Wasm globals sizes of more than 4KiB, or compiled in debug mode without optimizations, could leak data from the signal handler stack to guest programs. This can potentially cause data from the embedding host to leak to guest programs or cause corruption of guest program memory. This flaw was resolved by correcting the sigstack allocation logic.
Basic information
Type
reviewed
Severity
critical Advisory on GitHub
Open advisory ↗ Repository advisory
—
Source code
Browse source ↗ Published (advisory)
2021-08-25 20:46:16 UTC
Updated
2023-11-10 05:02:10 UTC
GitHub reviewed
2021-08-19 21:19:58 UTC
NVD published
2020-12-31
EPSS Score
Score
Percentile
0.43%
62.53%
CVSS Scores
Base score
Version
Severity
Vector
9.1
3.1
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
Affected packages (2)
Vulnerable version ranges and first patched releases as published by GitHub.
Ecosystem
Package
Vulnerable range
First patched
Vulnerable functions
rust
lucet-runtime-internals < 0.4.3
0.4.3
—
rust
lucet-runtime-internals >= 0.5.0, < 0.5.1
0.5.1
—
cvelogic
Threat Intelligence