SynopsisA server virtualization platform installed on the remote host is affected by multiple vulnerabilities.
DescriptionThe version of Citrix XenServer installed on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities :
- A flaw exists when invoking the instruction emulator that is triggered during the handling of SYSCALL by single-stepping applications. A local attacker can exploit this to execute code with elevated privileges on the guest. (CVE-2016-10013)
- An out-of-array memory access error exists in the memory_exchange() function within file common/memory.c due to improper checking of XENMEM_exchange input. An attacker on a 64-bit PV guest VM who has administrative privileges can exploit this issue to access arbitrary system memory locations, which can then be potentially used for further compromising the host. (CVE-2017-7228)
- A memory leak issue exits due to improper cleanup being performed during guest destruction. An attacker on the guest can exploit this, by repeatedly rebooting, to exhaust memory on the host system, resulting in a denial of service condition.
SolutionApply the appropriate hotfix according to the vendor advisory.