Bug 2269259 (CVE-2024-27894) - CVE-2024-27894 apache-pulsar: Pulsar Functions Worker Allows Unauthorized File Access and Unauthorized HTTP/HTTPS Proxying
Summary: CVE-2024-27894 apache-pulsar: Pulsar Functions Worker Allows Unauthorized Fil...
Keywords:
Status: NEW
Alias: CVE-2024-27894
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
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Depends On:
Blocks: 2269246
TreeView+ depends on / blocked
 
Reported: 2024-03-12 20:36 UTC by Marco Benatto
Modified: 2024-04-30 23:00 UTC (History)
33 users (show)

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A vulnerability was found in Apache Pulsar's ability to create functions through URL schemes. When retrieving the function implementation contained in the URL, Pulsar fails to limit access to some privileged resources. As a result, this flaw allows an attacker to gain access to sensitive information such as secrets, access to remote HTTP and HTTPS endpoints data, and possibly cause a denial of service. This vulnerability also affects Pulsar Broker deployments with the flag "functionsWorkerEnabled=true".
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Description Marco Benatto 2024-03-12 20:36:47 UTC 
The Pulsar Functions Worker includes a capability that permits authenticated users to create functions where the function's implementation is referenced by a URL. The supported URL schemes include "file", "http", and "https". When a function is created using this method, the Functions Worker will retrieve the implementation from the URL provided by the user. However, this feature introduces a vulnerability that can be exploited by an attacker to gain unauthorized access to any file that the Pulsar Functions Worker process has permissions to read. This includes reading the process environment which potentially includes sensitive information, such as secrets. Furthermore, an attacker could leverage this vulnerability to use the Pulsar Functions Worker as a proxy to access the content of remote HTTP and HTTPS endpoint URLs. This could also be used to carry out denial of service attacks.
This vulnerability also applies to the Pulsar Broker when it is configured with "functionsWorkerEnabled=true".

This issue affects Apache Pulsar versions from 2.4.0 to 2.10.5, from 2.11.0 to 2.11.3, from 3.0.0 to 3.0.2, from 3.1.0 to 3.1.2, and 3.2.0. 

2.10 Pulsar Function Worker users should upgrade to at least 2.10.6.
2.11 Pulsar Function Worker users should upgrade to at least 2.11.4.
3.0 Pulsar Function Worker users should upgrade to at least 3.0.3.
3.1 Pulsar Function Worker users should upgrade to at least 3.1.3.
3.2 Pulsar Function Worker users should upgrade to at least 3.2.1.

Users operating versions prior to those listed above should upgrade to the aforementioned patched versions or newer versions.

The updated versions of Pulsar Functions Worker will, by default, impose restrictions on the creation of functions using URLs. For users who rely on this functionality, the Function Worker configuration provides two configuration keys: "additionalEnabledConnectorUrlPatterns" and "additionalEnabledFunctionsUrlPatterns". These keys allow users to specify a set of URL patterns that are permitted, enabling the creation of functions using URLs that match the defined patterns. This approach ensures that the feature remains available to those who require it, while limiting the potential for unauthorized access and exploitation.

https://lists.apache.org/thread/45cqhgqg8d19ongjw18ypcss8vwh206p
https://pulsar.apache.org/security/CVE-2024-27894/
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