Chef Manage deserializes cookie data insecurely

Overview

Chef Manage add-on, version 1.11.4 and earlier, deserializes cookie data insecurely, which may be leveraged to gain unauthenticated remote code execution.

Description

CWE-502: Deserialization of Untrusted Data - CVE-2016-4326

Chef with the Chef Manage (previously known as ‘opscode-manage’) add-on enabled deserializes user-provided cookie data without properly validating it first. An unauthenticated attacker can provide specially crafted cookie data that, when deserialized, results in the execution of arbitrary code with the web server’s privileges.

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Impact

A remote, unauthenticated attacker can provide specially crafted cookie data that, when deserialized, will execute arbitrary code with the privileges of the web server.

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Solution

Apply an update

Releases of Chef Manage or opscode-manage since version 1.12.0 are not affected by this vulnerability. Users are encouraged to update to the latest release.

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Vendor Information

586503

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Chef Software Affected

Notified: March 29, 2016 Updated: May 13, 2016

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	10	AV:N/AC:L/Au:N/C:C/I:C/A:C
Temporal	7.8	E:POC/RL:OF/RC:C
Environmental	5.9	CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

• <https://www.chef.io/chef/&gt;
• <https://downloads.chef.io/chef-manage/ubuntu/&gt;
• <https://cwe.mitre.org/data/definitions/502.html&gt;

Acknowledgements

Thanks to Henrik Ferdinand Nölscher of Code-White GmbH for reporting this vulnerability.

This document was written by Joel Land.

Other Information

CVE IDs:	CVE-2016-4326
Date Public:	2016-05-17 Date First Published: