SB2019061312 - Denial of service in Xen

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

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

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)

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