Graphite graph database engine Insecure Deserialization Vulnerability

Graphite, a graph database engine, is susceptible to insecure deserialization in versions prior to 0.2. This vulnerability arises from the use of Python’s pickle module for serializing and deserializing database files. The pickle module is known to be unsafe when handling data from untrusted sources because it allows arbitrary code execution during the deserialization process. An attacker can exploit this by crafting a malicious Graphite database file containing embedded commands. When a vulnerable Graphite instance loads this file, the embedded commands are executed, leading to potential system compromise. The vulnerability has been patched in version 0.2, which migrates to a safer JSON-based storage format.

Attack Chain

1. Attacker crafts a malicious Graphite database file. This file contains serialized Python objects with malicious code embedded within them, leveraging the pickle module’s capability to execute arbitrary code during deserialization.
2. The attacker delivers the malicious database file to the target. This could be achieved through various means, such as social engineering, compromised file shares, or as part of a larger attack chain.
3. The victim, running a vulnerable version of Graphite (prior to 0.2), attempts to load the database file. This action triggers the pickle.load() function.
4. During the deserialization process, the pickle module executes the malicious code embedded in the serialized Python objects.
5. The attacker gains arbitrary code execution within the context of the Graphite process. This allows the attacker to perform various malicious activities, such as installing backdoors, stealing sensitive data, or disrupting services.
6. The attacker establishes persistence on the system, ensuring continued access even after the initial compromise.
7. The attacker escalates privileges to gain administrative control over the system.
8. The attacker uses the compromised system to move laterally within the network, compromising other systems and expanding their foothold.

Impact

Successful exploitation of this vulnerability allows attackers to achieve arbitrary code execution on systems running vulnerable versions of Graphite. The primary consequence is complete system compromise, including the potential for data theft, service disruption, and further lateral movement within the network. This vulnerability affects users who load database files from untrusted sources. Users of Graphite graph database engine versions before 0.2 are potentially impacted.

Recommendation

• Upgrade to Graphite version 0.2 or later to mitigate the pickle deserialization vulnerability, as it utilizes JSON for database storage instead (graphite.Migration module documentation).
• Refrain from loading Graphite database files from untrusted or unknown sources when using versions prior to 0.2 (see Workarounds).
• Migrate existing pickle-based Graphite databases to the JSON format using the provided convert_pickle_to_json function from the graphite.Migration module (see Workarounds).
• Deploy the following Sigma rule to detect attempts to load pickle files when running a patched version of Graphite.