Citrix Xen Xapi
By the Year
In 2023 there have been 0 vulnerabilities in Citrix Xen Xapi . Last year Xapi had 1 security vulnerability published. Right now, Xapi is on track to have less security vulnerabilities in 2023 than it did last year.
It may take a day or so for new Xapi vulnerabilities to show up in the stats or in the list of recent security vulnerabilties. Additionally vulnerabilities may be tagged under a different product or component name.
Recent Citrix Xen Xapi Security Vulnerabilities
XAPI open file limit DoS It is possible for an unauthenticated client on the network to cause XAPI to hit its file-descriptor limit
5.3 - Medium
- October 11, 2022
XAPI open file limit DoS It is possible for an unauthenticated client on the network to cause XAPI to hit its file-descriptor limit. This causes XAPI to be unable to accept new requests for other (trusted) clients, and blocks XAPI from carrying out any tasks that require the opening of file descriptors.
An issue was discovered in Xen XAPI before 2020-12-15
7.5 - High
- December 15, 2020
An issue was discovered in Xen XAPI before 2020-12-15. Certain xenstore keys provide feedback from the guest, and are therefore watched by toolstack. Specifically, keys are watched by xenopsd, and data are forwarded via RPC through message-switch to xapi. The watching logic in xenopsd sends one RPC update containing all data, any time any single xenstore key is updated, and therefore has O(N^2) time complexity. Furthermore, message-switch retains recent (currently 128) RPC messages for diagnostic purposes, yielding O(M*N) space complexity. The quantity of memory a single guest can monopolise is bounded by xenstored quota, but the quota is fairly large. It is believed to be in excess of 1G per malicious guest. In practice, this manifests as a host denial of service, either through message-switch thrashing against swap, or OOMing entirely, depending on dom0's configuration. (There are no quotas in xenopsd to limit the quantity of keys that result in RPC traffic.) A buggy or malicious guest can cause unreasonable memory usage in dom0, resulting in a host denial of service. All versions of XAPI are vulnerable. Systems that are not using the XAPI toolstack are not vulnerable.
Allocation of Resources Without Limits or Throttling
Stay on top of Security Vulnerabilities
Want an email whenever new vulnerabilities are published for Citrix Xen Xapi or by Citrix Xen? Click the Watch button to subscribe.