PT-2023-21998 · Apache+3 · Apache+4

Jake Howard · Published 2023-04-03 · Updated 2023-04-12 · CVE-2023-28837

Positive Technologies (AI Summary)

CVSS v4.0

5.9

Medium

Base vector

AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Wagtail versions prior to 4.1.4 and 4.2.2

Description A memory exhaustion bug exists in Wagtail's handling of uploaded images and documents. For both images and documents, files are loaded into memory during upload for additional processing. A user with access to upload images or documents through the Wagtail admin interface could upload a file so large that it results in a crash or denial of service. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. It can only be exploited by admin users with permission to upload images or documents. Image uploads are restricted to 10MB by default, however this validation only happens on the frontend and on the backend after the vulnerable code.

Recommendations For versions prior to 4.1.4, update to version 4.1.4 or later. For versions prior to 4.2.2, update to version 4.2.2 or later. As a temporary workaround, consider adding extra protections outside of Wagtail to limit the size of uploaded files, such as configuring client max body size in Nginx, LimitRequestBody in Apache, or using Cloudflare's or CloudFront's built-in limitations.

Exploit

Fix

Resource Exhaustion

Allocation of Resources Without Limits

Weakness Enumeration

CWE-400

CWE-770

Related Identifiers

CVE-2023-28837

GHSA-33PV-VCGH-JFG9

PYSEC-2023-56

Affected Products

Apache

Cloudfront

Cloudflared

Nginx

Wagtail

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28837.json · Exploit
• https://github.com/wagtail/wagtail/security/advisories/GHSA-33pv-vcgh-jfg9 · Vendor Advisory
• https://github.com/wagtail/wagtail/commit/cfa11bbe00dbe7ce8cd4c0bbfe2a898a690df2bf · Patch
• https://github.com/wagtail/wagtail/commit/3c0c64642b9e5b8d28b111263c7f4bddad6c3880 · Patch
• https://osv.dev/vulnerability/GHSA-33pv-vcgh-jfg9 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-28837 · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2023-56 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-28837 · Security Note
• https://github.com/wagtail/wagtail · Note
• https://github.com/wagtail/wagtail/commit/c9d2fcd650a88d76ae122646142245e5927a9165 · Note
• https://github.com/wagtail/wagtail/releases/tag/v4.1.4 · Note
• https://github.com/wagtail/wagtail/releases/tag/v4.2.2 · Note
• https://github.com/wagtail/wagtail/commit/d4022310cbe497993459c3136311467c7ac6329a · Note
• https://github.com/pypa/advisory-database/tree/main/vulns/wagtail/PYSEC-2023-56.yaml · Note
• https://t.me/cibsecurity/61341 · Telegram Post