Unchecked Return Value in Xen - CVE-2020-11742

Vulnerability identifier: #VU31971

CSH Severity: Medium

CVSS v4: 8.2 [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]

CVE-ID: CVE-2020-11742

CWE-ID: CWE-252

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 introduction of unexpected behavior in the fix for CVE-2017-1213 that caused bad continuation handling in GNTTABOP_copy. A remote user can crash the hypervisor.

Xen
Debian Linux
Gentoo Linux
Opensuse
Ubuntu
Fedora
xen (Alpine package)
xen
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)
IBM Systems Director

Install updates from vendor's website.

xen (Alpine package) - update to 4.10.4-r3
xen - addressed in versions 4.11.3-4.fc30, 4.11.4-1.fc30, 4.12.2-3.fc31, 4.13.0-7.fc32
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

• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00006.html
• http://www.openwall.com/lists/oss-security/2020/04/14/4
• http://xenbits.xen.org/xsa/advisory-318.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5M2XRNCHOGGTJQBZQJ7DCV6ZNAKN3LE2/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NVTP4OYHCTRU3ONFJOFJQVNDFB25KLLG/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YMAW7D2MP6RE4BFI5BZWOBBWGY3VSOFN/
• https://security.gentoo.org/glsa/202005-08
• https://www.debian.org/security/2020/dsa-4723
• https://xenbits.xen.org/xsa/advisory-318.html

• Multiple vulnerabilities in Xen
• OpenSUSE Linux update for xen
• Unchecked Return Value in xen (Alpine package)
• Gentoo update for Xen
• Debian update for xen
• Ubuntu update for xen
• Fedora 32 update for xen
• Fedora 31 update for xen
• Fedora 30 update for xen
• Fedora 30 update for xen