Marked is a markdown parser and compiler. Prior to version 4.0.10, the regular expression block.def may cause catastrophic backtracking against some strings and lead to a regular expression denial of service (ReDoS). Anyone who runs untrusted markdown through a vulnerable version of marked and does not use a worker with a time limit may be affected. This issue is patched in version 4.0.10. As a workaround, avoid running untrusted markdown through marked or run marked on a worker thread and set a reasonable time limit to prevent draining resources.
Weakness
The product does not properly control the allocation and maintenance of a limited resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Marked | Marked_project | * | 4.0.10 (excluding) |
| Red Hat Ceph Storage 6.1 | RedHat | rhceph/rhceph-6-dashboard-rhel9:6-75 | * |
| Node-marked | Ubuntu | bionic | * |
| Node-marked | Ubuntu | focal | * |
| Node-marked | Ubuntu | hirsute | * |
| Node-marked | Ubuntu | impish | * |
| Node-marked | Ubuntu | kinetic | * |
| Node-marked | Ubuntu | lunar | * |
| Node-marked | Ubuntu | mantic | * |
| Node-marked | Ubuntu | oracular | * |
| Node-marked | Ubuntu | plucky | * |
| Node-marked | Ubuntu | trusty | * |
| Node-marked | Ubuntu | xenial | * |
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/markedjs/marked/commit/c4a3ccd344b6929afa8a1d50ac54a721e57012c0
- https://github.com/markedjs/marked/releases/tag/v4.0.10
- https://github.com/markedjs/marked/security/advisories/GHSA-rrrm-qjm4-v8hf
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AIXDMC3CSHYW3YWVSQOXAWLUYQHAO5UX/
- https://github.com/markedjs/marked/commit/c4a3ccd344b6929afa8a1d50ac54a721e57012c0
- https://github.com/markedjs/marked/releases/tag/v4.0.10
- https://github.com/markedjs/marked/security/advisories/GHSA-rrrm-qjm4-v8hf
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AIXDMC3CSHYW3YWVSQOXAWLUYQHAO5UX/