GHSA-8vx6-69vg-c46f

Source

https://github.com/advisories/GHSA-8vx6-69vg-c46f

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/05/GHSA-8vx6-69vg-c46f/GHSA-8vx6-69vg-c46f.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-8vx6-69vg-c46f

Aliases

CVE-2023-2512

Related

CVE-2023-2512

Published

2023-05-12T20:16:38Z

Modified

2026-03-13T22:01:12.885199Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator

Summary

Buffer under-read in workerd

Details

Impact

Prior to version v1.20230419.0, the FormData API implementation was subject to an integer overflow. If a FormData instance contained more than 2^31 elements, the forEach() method could end up reading from the wrong location in memory while iterating over elements. This would most likely lead to a segmentation fault, but could theoretically allow arbitrary undefined behavior.

In order for the bug to be exploitable, the process would need to be able to allocate 160GB of RAM. Due to this, the bug was never exploitable on the Cloudflare Workers platform, but could theoretically be exploitable on deployments of workerd running on machines with a huge amount of memory. Moreover, in order to be remotely exploited, an attacker would have to upload a single form-encoded HTTP request of at least tens of gigabytes in size. The application code would then have to use request.formData() to parse the request and formData.forEach() to iterate over this data. Due to these limitations, the exploitation likelihood was considered Low.

Patches

A fix that addresses this vulnerability has been released in version v1.20230419.0 and users are encouraged to update to the latest version available.

References

Release - https://github.com/cloudflare/workerd/releases/tag/v1.20230419.0

Database specific

{
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-125",
        "CWE-127",
        "CWE-190"
    ],
    "github_reviewed_at": "2023-05-12T20:16:38Z",
    "nvd_published_at": "2023-05-12T11:15:13Z",
    "severity": "MODERATE"
}

References

Affected packages

npm / workerd

Package

Name: workerd; View open source insights on deps.dev
Purl: pkg:npm/workerd

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.20230419.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/05/GHSA-8vx6-69vg-c46f/GHSA-8vx6-69vg-c46f.json"