CVE-2013-7489: 
Python vulnerability analysis and mitigation

The Beaker library through version 1.11.0 for Python is affected by a deserialization of untrusted data vulnerability (CVE-2013-7489), which was disclosed on June 26, 2020. This vulnerability affects the caching functionality of the Beaker library and could potentially lead to arbitrary code execution (NVD).

The vulnerability stems from Beaker's use of Python's Pickle serialization method by default in its Cache functionality. While the Session feature has support for secret/HMAC verification, the Cache layer does not implement similar security measures for data verification before deserialization, making it susceptible to untrusted data deserialization attacks (GitHub Issue, OSS Security). The vulnerability has been assigned a CVSS v3.1 Base Score of 6.8 (Medium) with the vector string: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H (NVD).

If successfully exploited, this vulnerability could allow an attacker to execute arbitrary code on the machine running Beaker. This is possible if an attacker can insert malicious payloads into the cache database, for example, if they have network access and credentials for the database (Red Hat Bugzilla).

To mitigate this vulnerability, it is recommended to implement proper access control on the Beaker cache database to prevent unauthorized writes. Additionally, when using the Session feature, the signing functionality should be used to verify the integrity of data retrieved from the database before deserialization. The vulnerability cannot be triggered if the Cache functionality of Beaker is not used (Red Hat Bugzilla). The maintainer has suggested implementing signing of cache data upon commit to the database to be verified upon retrieval.