XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. A user able to attach a file to a page can post a malformed TAR file by manipulating file modification times headers, which when parsed by Tika, could cause a denial of service issue via CPU consumption. This vulnerability has been patched in XWiki 14.10.18, 15.5.3 and 15.8 RC1.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xwiki | Xwiki | 14.10 (including) | 14.10.18 (excluding) |
| Xwiki | Xwiki | 15.5 (including) | 15.5.3 (excluding) |
| Xwiki | Xwiki | 15.6 (including) | 15.8 (excluding) |
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.