CVE-2023-22735

Zulip 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.

CVSS v3.0 4.6 MEDIUM

4.6^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 2.1 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/zulip/zulip/commit/2f6c5a883e106aa82a570d3d1f243993284b70f3	Patch
https://zulip.readthedocs.io/en/latest/production/upgrade-or-modify.html#upgrading-from-a-git-repository	Not Applicable
https://github.com/zulip/zulip/security/advisories/GHSA-wm83-3764-5wqh	Patch Vendor Advisory
https://github.com/zulip/zulip/commit/04cf68b45ebb5c03247a0d6453e35ffc175d55da	Product

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Configurations

Configuration 1 (hide)

cpe:2.3:a:zulip:zulip_server:2023-01-09:*:*:*:*:*:*:*

Information

Published : 2023-02-07 11:15

Updated : 2023-02-16 07:51

NVD link : CVE-2023-22735

Mitre link : CVE-2023-22735

JSON object : View

CWE

CWE-436

Interpretation Conflict

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Products Affected

zulip

zulip_server

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