ArchLinux: 202105-9: hedgedoc: cross-site scripting

Advisories

Arch Linux Security Advisory ASA-202105-9
=========================================

Severity: High
Date    : 2021-05-19
CVE-ID  : CVE-2021-29503
Package : hedgedoc
Type    : cross-site scripting
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1946

Summary
=======

The package hedgedoc before version 1.8.2-1 is vulnerable to cross-site
scripting.

Resolution
==========

Upgrade to 1.8.2-1.

# pacman -Syu "hedgedoc>=1.8.2-1"

The problem has been fixed upstream in version 1.8.2.

Workaround
==========

In order to prevent unauthenticated attacks it can be useful to disable
guest edits until the next update. To do this, set the following to
configuration options:

{
    # other configs
    # …
     "allowAnonymous": false,
     "allowAnonymousEdits": false,

}

Or set the environment variables CMD_ALLOW_ANONYMOUS=false and
CMD_ALLOW_ANONYMOUS_EDITS=false.

Description
===========

HedgeDoc before version 1.8.2  is vulnerable to a cross-site scripting
(XSS) attack using the YAML-metadata of a note. An attacker with write
access to a note can embed HTML tags in the Open Graph metadata section
of the note, resulting in the frontend rendering the script tag as part
of the 
	 section.

This vulnerability affects all installations. Unless your instance
prevents guests from editing notes, this vulnerability allows
unauthenticated attackers to inject JavaScript into notes that allow
guest edits. If your instance prevents guests from editing notes, this
vulnerability allows authenticated attackers to inject JavaScript into
any note pages they have write-access to.

Impact
======

A remote attacker with write access to a note can inject arbitrary
JavaScript code that is executed through cross-site scripting when the
note is viewed.

References
==========

https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq
https://github.com/hedgedoc/hedgedoc/commit/4a0216096a6aa1ebba9d8b0ada067c73ffa1513f
https://security.archlinux.org/CVE-2021-29503

ArchLinux: 202105-9: hedgedoc: cross-site scripting

May 20, 2021
The package hedgedoc before version 1.8.2-1 is vulnerable to cross-site scripting

Summary

HedgeDoc before version 1.8.2 is vulnerable to a cross-site scripting (XSS) attack using the YAML-metadata of a note. An attacker with write access to a note can embed HTML tags in the Open Graph metadata section of the note, resulting in the frontend rendering the script tag as part of the section.
This vulnerability affects all installations. Unless your instance prevents guests from editing notes, this vulnerability allows unauthenticated attackers to inject JavaScript into notes that allow guest edits. If your instance prevents guests from editing notes, this vulnerability allows authenticated attackers to inject JavaScript into any note pages they have write-access to.

Resolution

Upgrade to 1.8.2-1.
# pacman -Syu "hedgedoc>=1.8.2-1"
The problem has been fixed upstream in version 1.8.2.

References

https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq https://github.com/hedgedoc/hedgedoc/commit/4a0216096a6aa1ebba9d8b0ada067c73ffa1513f https://security.archlinux.org/CVE-2021-29503

Severity
CVE-ID : CVE-2021-29503
Package : hedgedoc
Type : cross-site scripting
Remote : Yes
Link : https://security.archlinux.org/AVG-1946

Impact

A remote attacker with write access to a note can inject arbitrary JavaScript code that is executed through cross-site scripting when the note is viewed.

Workaround

In order to prevent unauthenticated attacks it can be useful to disable guest edits until the next update. To do this, set the following to configuration options:
{ # other configs # … "allowAnonymous": false, "allowAnonymousEdits": false,
}
Or set the environment variables CMD_ALLOW_ANONYMOUS=false and CMD_ALLOW_ANONYMOUS_EDITS=false.

Related News

© 2022 Guardian Digital, Inc All Rights Reserved

We use cookies to provide and improve our services. By using our site, you consent to our Cookie Policy.