SB20240717125 - Multiple vulnerabilities in Xen

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Improper locking (CVE-ID: CVE-2024-31143)

The vulnerability allows a malicious guest to perform a denial of service (DoS) attack.

The vulnerability exists due to double unlock in x86 guest IRQ handling. An optional feature of PCI MSI called "Multiple Message" allows a device to use multiple consecutive interrupt vectors. A malicious guest can crash the hypervisor.

2) Improper neutralization of special elements in output used by a downstream component (CVE-ID: CVE-2024-31144)

The vulnerability allows a malicious guest to compromise other guests.

The vulnerability exists due to improper validation of metadata in xapi when restoring data from backup. A malicious guest can manipulate disks to appear to be a metadata backup and trick the guest administrator to recover the system from a malicious backup.

Systems running Xapi v1.249.x are affected.

Remediation

Install update from vendor's website.

References

• https://xenbits.xen.org/xsa/advisory-458.html
• https://xenbits.xen.org/xsa/advisory-459.html