Scylla prior 4.6.7/5.0.3/2020.1.14/2021.1.12/2022.1.0 CQL Frame uninitialized resource

Summaryinfo

A vulnerability labeled as critical has been found in Scylla. Impacted is an unknown function of the component CQL Frame Handler. Executing a manipulation can lead to uninitialized resource. This vulnerability appears as CVE-2022-29240. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Scylla. It has been declared as critical. This vulnerability affects an unknown part of the component CQL Frame Handler. The manipulation with an unknown input leads to a uninitialized resource vulnerability. The CWE definition for the vulnerability is CWE-908. The product uses or accesses a resource that has not been initialized. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Scylla is a real-time big data database that is API-compatible with Apache Cassandra and Amazon DynamoDB. When decompressing CQL frame received from user, Scylla assumes that user-provided uncompressed length is correct. If user provides fake length, that is greater than the real one, part of decompression buffer won't be overwritten, and will be left uninitialized. This can be exploited in several ways, depending on the privileges of the user. 1. The main exploit is that an attacker with access to CQL port, but no user account, can bypass authentication, but only if there are other legitimate clients making connections to the cluster, and they use LZ4. 2. Attacker that already has a user account on the cluster can read parts of uninitialized memory, which can contain things like passwords of other users or fragments of other queries / results, which leads to authorization bypass and sensitive information disclosure. The bug has been patched in the following versions: Scylla Enterprise: 2020.1.14, 2021.1.12, 2022.1.0. Scylla Open Source: 4.6.7, 5.0.3. Users unable to upgrade should make sure none of their drivers connect to cluster using LZ4 compression, and that Scylla CQL port is behind firewall. Additionally make sure no untrusted client can connect to Scylla, by setting up authentication and applying workarounds from previous point (firewall, no lz4 compression).

The weakness was presented 09/16/2022 as GHSA-25pq-rrqm-6fmr. The advisory is shared for download at github.com. This vulnerability was named CVE-2022-29240 since 04/13/2022. There are neither technical details nor an exploit publicly available.

Upgrading to version 4.6.7, 5.0.3, 2020.1.14, 2021.1.12 or 2022.1.0 eliminates this vulnerability. Applying the patch 1c2eef384da439b0457b6d71c7e37d7268e471cb is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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• Scylla

License

• open-source

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