CVE-2023-22735

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Summary

CVECVE-2023-22735
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-02-07 19:15:00 UTC
Updated2023-11-07 04:07:00 UTC
DescriptionZulip is an open-source team collaboration tool. In versions of zulip prior to commit `2f6c5a8` but after commit `04cf68b` users could upload files with arbitrary `Content-Type` which would be served from the Zulip hostname with `Content-Disposition: inline` and no `Content-Security-Policy` header, allowing them to trick other users into executing arbitrary Javascript in the context of the Zulip application. Among other things, this enables session theft. Only deployments which use the S3 storage (not the local-disk storage) are affected, and only deployments which deployed commit 04cf68b45ebb5c03247a0d6453e35ffc175d55da, which has only been in `main`, not any numbered release. Users affected should upgrade from main again to deploy this fix. Switching from S3 storage to the local-disk storage would nominally mitigate this, but is likely more involved than upgrading to the latest `main` which addresses the issue.

Risk And Classification

Problem Types: CWE-436

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Zulip Zulip Server 2023-01-09 All All All

References

ReferenceSourceLinkTags
User uploads proxied from S3 lack `Content-Security-Policy` headers, may be served with `Content-Disposition: inline` · Advisory · zulip/zulip · GitHub MISC github.com
Upgrade or modify Zulip — Zulip 7.0-dev+git documentation MISC zulip.readthedocs.io
CVE-2023-22735: Provide the Content-Disposition header from S3. · zulip/zulip@2f6c5a8 · GitHub MISC github.com
uploads: Serve S3 uploads directly from nginx. · zulip/zulip@04cf68b · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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