Citrix XenServer Multiple memory_exchange() Hypercall Error Handling DoS (CTX203451)
Medium Nessus Plugin ID 87373
SynopsisThe remote host is affected by multiple denial of service vulnerabilities.
DescriptionThe version of Citrix XenServer running on the remote host is affected by multiple denial of service vulnerabilities due to multiple flaws in the memory_exchange() function in memory.c that are triggered when handling hypercall XENMEM_exchange errors. A local attacker within a guest can exploit these flaws to cause a deadlock, resulting in a denial of service condition.
SolutionApply the relevant hotfix referenced in the vendor advisory.