Resource management error in Xen - CVE-2020-15564

Vulnerability identifier: #VU29599

CSH Severity: Low

CVSS v4: 4.3 [CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H]

CVE-ID: CVE-2020-15564

CWE-ID: CWE-399

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

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

The vulnerability exists due to missing alignment check in VCPUOP_register_vcpu_info hypercall in Xen. A attacker with privileged access to guest operating system can crash the hypervisor.

Note: the vulnerability affects Arm systems only.

Xen
Debian Linux
Gentoo Linux
Ubuntu
Fedora
xen (Alpine package)
libxengnttab1 (Ubuntu package)
xen-hypervisor-4.11-amd64 (Ubuntu package)
xen-hypervisor-4.11-armhf (Ubuntu package)
libxenmisc4.11 (Ubuntu package)
libxendevicemodel1 (Ubuntu package)
xenstore-utils (Ubuntu package)
xen-utils-4.11 (Ubuntu package)
xen-hypervisor-4.11-arm64 (Ubuntu package)
xen-utils-common (Ubuntu package)
libxenevtchn1 (Ubuntu package)
xen (Debian package)
xen
IBM Systems Director

Install updates from vendor's website.

xen (Alpine package) - update to 4.12.3-r2
libxengnttab1 (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
xen-hypervisor-4.11-amd64 (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
xen-hypervisor-4.11-armhf (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
libxenmisc4.11 (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
libxendevicemodel1 (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
xenstore-utils (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
xen-utils-4.11 (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
xen-hypervisor-4.11-arm64 (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
xen-utils-common (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
libxenevtchn1 (Ubuntu package) - update to 4.11.3+24-g14b62ab3e5-1ubuntu2.3
xen (Debian package) - update to 4.11.4+24-gddaaccbbab-1~deb10u1
xen - addressed in versions 4.12.3-3.fc31, 4.13.1-4.fc32

• http://www.openwall.com/lists/oss-security/2020/07/07/5
• http://xenbits.xen.org/xsa/advisory-327.html

• Multiple vulnerabilities in Xen
• Gentoo update for Xen
• Resource management error in xen (Alpine package)
• Debian update for xen
• Ubuntu update for xen
• Fedora 32 update for xen
• Fedora 31 update for xen