rulex up to 0.4.2 Expression Parser recursion

Summaryinfo

A vulnerability, which was classified as critical, has been found in rulex up to 0.4.2. This affects an unknown part of the component Expression Parser. Performing a manipulation results in recursion. This vulnerability is known as CVE-2022-31099. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in rulex up to 0.4.2. It has been classified as critical. This affects an unknown functionality of the component Expression Parser. The manipulation with an unknown input leads to a recursion vulnerability. CWE is classifying the issue as CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. This is going to have an impact on availability. The summary by CVE is:

rulex is a new, portable, regular expression language. When parsing untrusted rulex expressions, the stack may overflow, possibly enabling a Denial of Service attack. This happens when parsing an expression with several hundred levels of nesting, causing the process to abort immediately. This is a security concern for you, if your service parses untrusted rulex expressions (expressions provided by an untrusted user), and your service becomes unavailable when the process running rulex aborts due to a stack overflow. The crash is fixed in version **0.4.3**. Affected users are advised to update to this version. There are no known workarounds for this issue.

The weakness was published 06/28/2022 as GHSA-v78m-2q7v-fjqp. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2022-31099 since 05/18/2022. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 0.4.3 eliminates this vulnerability. Applying the patch 60aa2dc03a22d69c8800fec81f99c96958a11363 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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Productinfo

Name

• rulex

Version

• 0.4.0
• 0.4.1
• 0.4.2

License

• open-source

CPE 2.3info

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CPE 2.2info

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