SB2019061312 - Denial of service in Xen

Description

This security bulletin contains information about 2 vulnerabilities.

1) Infinite loop (CVE-ID: CVE-2019-17349)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

An issue was discovered in Xen through 4.12.x allowing Arm domU attackers to cause a denial of service (infinite loop) involving a LoadExcl or StoreExcl operation.

2) Infinite loop (CVE-ID: CVE-2019-17350)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/U:Green

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

An issue was discovered in Xen through 4.12.x allowing Arm domU attackers to cause a denial of service (infinite loop) involving a compare-and-exchange operation.

Remediation

Install update from vendor's website.

References

• http://xenbits.xen.org/xsa/advisory-295.html
• https://seclists.org/bugtraq/2020/Jan/21
• https://www.debian.org/security/2020/dsa-4602
• https://xenbits.xen.org/xsa/advisory-295.html