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CVE-2020-35912

CVE-2020-35912:
Data races in lock_api

4.7

CVSS Score
3.1

Basic Information

CVE ID
CVE-2020-35912
GHSA ID
GHSA-5wg8-7c9q-794v
EPSS Score
0.12692%
CWE
CWE-362
Published
8/25/2021
Updated
6/13/2023
KEV Status
No
Technology
TechnologyRust

Technical Details

CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Package NameEcosystemVulnerable VersionsFirst Patched Version
lock_apirust< 0.4.20.4.2

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from improper trait implementations (Send/Sync) on various guard types. The advisory explicitly lists MappedMutexGuard, MappedRwLockReadGuard, MappedRwLockWriteGuard, RwLockReadGuard, and RwLockWriteGuard as having unsound implementations. These guards' Deref and DerefMut implementations would allow accessing protected data across thread boundaries without proper synchronization. The pull request #262 in parking_lot (which uses lock_api) shows fixes to trait bounds verification, confirming that the core issue was in these guard types' synchronization primitive implementations.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

*n issu* w*s *is*ov*r** in t** lo*k_*pi *r*t* ***or* *.*.* *or Rust. * **t* r*** **n o**ur ****us* o* M*pp**RwLo*kWrit**u*r* unsoun*n*ss.

Reasoning

T** vuln*r**ility st*ms *rom improp*r tr*it impl*m*nt*tions (S*n*/Syn*) on v*rious *u*r* typ*s. T** **visory *xpli*itly lists M*pp**Mut*x*u*r*, M*pp**RwLo*kR****u*r*, M*pp**RwLo*kWrit**u*r*, RwLo*kR****u*r*, *n* RwLo*kWrit**u*r* *s **vin* unsoun* imp