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CVE-2020-36203

CVE-2020-36203: Data races in reffers

4.7

CVSS Score
3.1

Basic Information

CVE ID
CVE-2020-36203
GHSA ID
GHSA-39xg-8p43-h76x
EPSS Score
0.13655%
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
reffersrust< 0.6.10.6.1

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from missing Send + Sync trait bounds on the generic type V in ARefss's mapping functions. The commit diff shows these bounds were added to both map() and try_map() in ARefss implementations. Before the fix, these functions allowed wrapping types that aren't thread-safe (V: !Send/!Sync) into ARefss which claims Send + Sync guarantees, enabling concurrent unsynchronized access. The PoC demonstrates how this could create data races with Cell (which is !Sync), confirming the exploit path through these functions.

Vulnerable functions

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

WAF Protection Rules

WAF Rule

*R**ss<'*, V> is * typ* t**t is *ssum** to *ont*in o*j**ts t**t *r* S*n* + Syn*. In t** *****t** v*rsions o* t*is *r*t*, S*n*/Syn* tr*its *r* un*on*ition*lly impl*m*nt** *or *R**ss<'*, V>. *y usin* t** *R**ss::m*p() *PI, w* **n ins*rt * !S*n* or !S

Reasoning

T** vuln*r**ility st*ms *rom missin* S*n* + Syn* tr*it *oun*s on t** **n*ri* typ* V in *R**ss's m*ppin* *un*tions. T** *ommit *i** s*ows t**s* *oun*s w*r* ***** to *ot* m*p() *n* try_m*p() in *R**ss impl*m*nt*tions. ***or* t** *ix, t**s* *un*tions *l