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CVE-2023-3348

CVE-2023-3348:
Cloudflare Wrangler directory traversal vulnerability

5.7

CVSS Score
3.1

Basic Information

CVE ID
CVE-2023-3348
GHSA ID
GHSA-8c93-4hch-xgxp
EPSS Score
0.43342%
CWE
CWE-22
Published
8/3/2023
Updated
11/8/2023
KEV Status
No
Technology
TechnologyJavaScript

Technical Details

CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
wranglernpm< 2.20.12.20.1

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stemmed from improper path handling in the local development server's asset serving logic. The commit diff shows critical changes in assets.ts where: 1) directory paths are resolved to absolute paths, and 2) a security check was added to ensure resolved file paths start with the build directory. The vulnerable version lacked these protections, allowing attackers to escape the restricted directory via crafted paths. The findAssetEntryForPath() function was directly responsible for mapping URLs to filesystem paths without proper containment checks prior to the patch.

Vulnerable functions

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

WAF Protection Rules

WAF Rule

### Imp**t T** Wr*n*l*r *omm*n* lin* tool (<=wr*n*l*r@*.*.* or <=wr*n*l*r@*.**.*) w*s *****t** *y * *ir**tory tr*v*rs*l vuln*r**ility w**n runnin* * lo**l **v*lopm*nt s*rv*r *or P***s (wr*n*l*r p***s **v *omm*n*). T*is vuln*r**ility *n**l** *n *tt**

Reasoning

T** vuln*r**ility st*mm** *rom improp*r p*t* **n*lin* in t** lo**l **v*lopm*nt s*rv*r's *ss*t s*rvin* lo*i*. T** *ommit *i** s*ows *riti**l ***n**s in `*ss*ts.ts` w**r*: *) *ir**tory p*t*s *r* r*solv** to **solut* p*t*s, *n* *) * s**urity ****k w*s *