CVE-2021-29469

Node-redis is a Node.js Redis client. Before version 3.1.1, when a client is in monitoring mode, the regex begin used to detected monitor messages could cause exponential backtracking on some strings. This issue could lead to a denial of service. The issue is patched in version 3.1.1.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

Potential Mitigations

• Mitigation of resource exhaustion attacks requires that the target system either:

• The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

• The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/147.html
• https://cwe.mitre.org/data/definitions/227.html
• https://cwe.mitre.org/data/definitions/492.html

References

• https://github.com/NodeRedis/node-redis/commit/2d11b6dc9b9774464a91fb4b448bad8bf699629e
• https://github.com/NodeRedis/node-redis/releases/tag/v3.1.1
• https://github.com/NodeRedis/node-redis/security/advisories/GHSA-35q2-47q7-3pc3
• https://security.netapp.com/advisory/ntap-20210611-0010/
• https://github.com/NodeRedis/node-redis/commit/2d11b6dc9b9774464a91fb4b448bad8bf699629e
• https://github.com/NodeRedis/node-redis/releases/tag/v3.1.1
• https://github.com/NodeRedis/node-redis/security/advisories/GHSA-35q2-47q7-3pc3
• https://security.netapp.com/advisory/ntap-20210611-0010/