CVE-2012-5499 in Plone
Summary
by MITRE
python_scripts.py in Plone before 4.2.3 and 4.3 before beta 1 allows remote attackers to cause a denial of service (memory consumption) via a large value, related to formatColumns.
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Analysis
by VulDB Data Team • 03/29/2022
The vulnerability identified as CVE-2012-5499 affects the Plone content management system and specifically targets the python_scripts.py module within versions prior to 4.2.3 and 4.3 beta 1. This issue represents a denial of service weakness that can be exploited by remote attackers to consume excessive system memory resources. The vulnerability manifests when the formatColumns function processes unusually large input values, creating a scenario where memory allocation spirals out of control. The flaw stems from inadequate input validation and bounds checking within the script processing logic, allowing malicious actors to craft specific inputs that trigger unbounded memory growth during column formatting operations.
The technical implementation of this vulnerability resides in the python_scripts.py file which handles various scripting operations within the Plone framework. When the formatColumns function receives a large value parameter, the internal processing logic fails to implement proper size limitations or memory constraints. This lack of input sanitization creates a path where attacker-controlled data can influence memory allocation patterns, leading to gradual memory exhaustion. The vulnerability operates at the application layer and requires no authentication to exploit, making it particularly dangerous in publicly accessible environments. According to CWE standards, this represents a weakness categorized under CWE-770, which deals with allocation of resources without limits or with inadequate limits, directly linking to the unbounded memory consumption behavior.
From an operational perspective, this vulnerability poses significant risks to Plone deployments as it can be exploited to cause complete service disruption through memory exhaustion. Attackers can repeatedly submit large values to trigger the vulnerable code path, gradually consuming available memory until the system becomes unresponsive or crashes entirely. The impact extends beyond simple service interruption as it can affect other applications running on the same system due to resource contention. The vulnerability affects both the 4.2.x series and the pre-beta 1 version of 4.3, indicating it was present across multiple release branches and likely impacted a substantial portion of Plone installations. Organizations using affected versions face potential business disruption and may experience cascading failures in dependent services that rely on the compromised system.
Mitigation strategies for CVE-2012-5499 focus primarily on upgrading to patched versions of Plone where the vulnerability has been addressed through proper input validation and memory limit enforcement. The recommended approach involves immediate deployment of Plone 4.2.3 or later releases, or 4.3 beta 1 and subsequent versions that contain the necessary code modifications. Additionally, implementing input validation measures at the application level can provide temporary protection by limiting the size of parameters accepted by the formatColumns function. Network-level firewalls and intrusion prevention systems can also be configured to monitor and block suspicious patterns that might indicate exploitation attempts. Organizations should also consider implementing resource monitoring and alerting mechanisms to detect unusual memory consumption patterns that could indicate exploitation of this vulnerability. The ATT&CK framework categorizes this as a resource exhaustion technique under the T1499 category, highlighting the importance of both preventive measures and detection capabilities in defending against such attacks.