SB2018010601 - Multiple vulnerabilities in Xen
Published: January 6, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 vulnerabilities.
1) Memory corruption (CVE-ID: CVE-2017-17563)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows an adjacent attacker to gain elevated privileges or cause a denial of service (DoS) condition on a targeted host system.
The weakness exists due to insufficient reference count overflow checking. An adjacent attacker can use a mask that is larger than the reference count that is set on a targeted system, trigger memory corruption and cause the hypervisor to crash or gain elevated privileges.
2) Denial of service (CVE-ID: CVE-2017-17566)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows an adjacent attacker to cause DoS condition on the target system.
The weakness exists due to improper auxiliary page mapping. A remote attacker can cause the system to crash.
3) Denial of service (CVE-ID: CVE-2017-17565)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows an adjacent attacker to cause DoS condition on the target system.
The weakness exists due to improper assertion related to machine-to-physical (M2P) translation table entries. A remote attacker can cause the system to crash.
4) Denial of service (CVE-ID: CVE-2017-17564)
CWE-ID: CWE-388 - Error Handling
CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows an adjacent attacker to cause DoS condition or gain elevated privileges.
The weakness exists due to improper error handling for reference counts. A remote attacker can trigger memory corruption, cause the hypervisor to crash or gain elevated privileges on the target system.
Remediation
Install update from vendor's website.