Missing Authorization in Xen - CVE-2020-11741

Vulnerability identifier: #VU31975

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-2020-11741

CWE-ID: CWE-862

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

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

An issue was discovered in xenoprof in Xen through 4.13.x, allowing guest OS users (with active profiling) to obtain sensitive information about other guests, cause a denial of service, or possibly gain privileges. For guests for which "active" profiling was enabled by the administrator, the xenoprof code uses the standard Xen shared ring structure. Unfortunately, this code did not treat the guest as a potential adversary: it trusts the guest not to modify buffer size information or modify head / tail pointers in unexpected ways. A remote user can perform a denial of service (DoS) attack.

Xen
Gentoo Linux
Debian 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)

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/2020/04/14/1
• http://xenbits.xen.org/xsa/advisory-313.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-313.html

• Multiple vulnerabilities in Xen
• OpenSUSE Linux update for xen
• Missing Authorization 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