SB2017050307 - Multiple vulnerabilities in Xen

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Privilege escalation (CVE-ID: CVE-2017-8903)

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to an error in the GNTTABOP_transfer operation. A local attacker can use a specially crafted IRET hypercall, gain write access to kernel page tables and execute arbitrary code on the host OS with elevated privileges.

Successful exploitation of the vulnerability results in privilege escalation.

2) Privilege escalation (CVE-ID: CVE-2017-8904)

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to an error in the GNTTABOP_transfer operation. A local attacker can transfer a page to another guest, access all of the system memory and execute arbitrary code on the host OS with elevated privileges.

Successful exploitation of the vulnerability results in privilege escalation.

3) Privilege escalation (CVE-ID: CVE-2017-8905)

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to insufficient validation of user-supplied input. A local attacker can use a failsafe callback to modify part of a physical memory page, execute arbitrary code on the host OS with elevated privileges.

Successful exploitation of the vulnerability may result in privilege escalation.

Remediation

Install update from vendor's website.

References

• http://xenbits.xen.org/xsa/advisory-213.html
• http://xenbits.xen.org/xsa/advisory-214.html
• http://xenbits.xen.org/xsa/advisory-215.html