ID

VAR-202004-0464

CVE

CVE-2020-11742

TITLE

Xen Vulnerability in

DESCRIPTION

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of bad continuation handling in GNTTABOP_copy. Grant table operations are expected to return 0 for success, and a negative number for errors. The fix for CVE-2017-12135 introduced a path through grant copy handling where success may be returned to the caller without any action taken. In particular, the status fields of individual operations are left uninitialised, and may result in errant behaviour in the caller of GNTTABOP_copy. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to copy a grant, it hits the incorrect exit path. This returns success to the caller without doing anything, which may cause crashes or other incorrect behaviour. Xen There is an unspecified vulnerability in.Service operation interruption (DoS) It may be put into a state. Xen is an open source virtual machine monitor product from the University of Cambridge. The product enables different and incompatible operating systems to run on the same computer and supports migration during runtime to ensure normal operation and avoid downtime. There are security vulnerabilities in Xen 4.13.x and previous versions. An attacker can use this vulnerability to cause a denial of service. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202005-08 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: Xen: Multiple vulnerabilities Date: May 14, 2020 Bugs: #717446 ID: 202005-08 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities have been found in Xen, the worst of which could allow privilege escalation. Background ========== Xen is a bare-metal hypervisor. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-emulation/xen < 4.12.2-r2 >= 4.12.2-r2 2 app-emulation/xen-tools < 4.12.2-r2 >= 4.12.2-r2 ------------------------------------------------------------------- 2 affected packages Description =========== Multiple vulnerabilities have been discovered in Xen. Please review the CVE identifiers referenced below for details. Impact ====== Please review the referenced CVE identifiers for details. Workaround ========== There is no known workaround at this time. Resolution ========== All Xen users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-emulation/xen-4.12.2-r2" References ========== [ 1 ] CVE-2020-11739 https://nvd.nist.gov/vuln/detail/CVE-2020-11739 [ 2 ] CVE-2020-11740 https://nvd.nist.gov/vuln/detail/CVE-2020-11740 [ 3 ] CVE-2020-11741 https://nvd.nist.gov/vuln/detail/CVE-2020-11741 [ 4 ] CVE-2020-11742 https://nvd.nist.gov/vuln/detail/CVE-2020-11742 [ 5 ] CVE-2020-11743 https://nvd.nist.gov/vuln/detail/CVE-2020-11743 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202005-08 Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2020 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. https://creativecommons.org/licenses/by-sa/2.5 . For the stable distribution (buster), these problems have been fixed in version 4.11.4+24-gddaaccbbab-1~deb10u1. We recommend that you upgrade your xen packages. For the detailed security status of xen please refer to its security tracker page at: https://security-tracker.debian.org/tracker/xen Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEtuYvPRKsOElcDakFEMKTtsN8TjYFAl8Lc/AACgkQEMKTtsN8 TjaMdxAAqGcAm1NI7JRg7LQprevLCPkxPItZapx3n/q/W6HwiGQxC6KP9Ntp3ArR QiIeIPzTWVMHcaahlgkLePaFPU3MCe5TkL0GKG1JIAD8JieKBSrAWJ6tqTiZx+G+ anbksp/I9Mq9nciMlnPXeOVQgksoCB0tFYC2Ld+H7btZdD5G4KpJsz25c0S5poxW sIXLgNXIzmZcI8mVzUlt+w0FG3tnolr/kJppHBkgC46riVcy8LHRaRQiVTjwqjSn Eop4oXxLDZ/qH8k+0JAZLtBPpc9PfQcLxCJnhH8z76QdPPkcJuNFx5zRXqr1dZfG AkRuG6LZa2tRGYzKZmo7BMj5dUei4xhDHLAoWGhSHkTmYtdc1Kyy4+duGPEChSCm fCSC1FhFJFK30iq918cunWtjhRrEqrJr10HuC+YlSXfqrv1Z12fPw3UPRJmdG2Dv UPS5vT8/NwF0osNrvNE+rkhYXTEKECE756pP3jTV4+BBBgf9DLtbV0EvYq1YWlJw iT+KnzX9iW/jJg3bC32+UJlVv7IAkb8F9hcK3wKpvgSUVJIDWN352rfW7p8/xZoj 7eIlmZwDPKWsyMlbt2OsyYQFQlBvNsk0+7ycu9hG6fBaF5ATSxTO+A43Q7OxorP9 g8OhDVMgrx5GM4rXSZ60J6uxkd2eUns4Ud8pDGG8XTpnRBxD8Kk= =tfm7 -----END PGP SIGNATURE----- . Software Description: - xen: Public headers and libs for Xen Details: It was discovered that memory contents previously stored in microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors may be briefly exposed to processes on the same or different processor cores. (CVE-2020-0543) Julien Grall discovered that Xen incorrectly handled memory barriers on ARM-based systems. (CVE-2020-11739) Ilja Van Sprundel discovered that Xen incorrectly handled profiling of guests. (CVE-2020-11740, CVE-2020-11741) It was discovered that Xen incorrectly handled grant tables. (CVE-2020-11742, CVE-2020-11743) Jan Beulich discovered that Xen incorrectly handled certain code paths. (CVE-2020-15563) Julien Grall discovered that Xen incorrectly verified memory addresses provided by the guest on ARM-based systems. (CVE-2020-15564) Roger Pau Monn\xe9 discovered that Xen incorrectly handled caching on x86 Intel systems. (CVE-2020-15565) It was discovered that Xen incorrectly handled error in event-channel port allocation. (CVE-2020-15566) Jan Beulich discovered that Xen incorrectly handled certain EPT (Extended Page Tables). (CVE-2020-15567) Andrew Cooper discovered that Xen incorrectly handled PCI passthrough. (CVE-2020-25595) Andrew Cooper discovered that Xen incorrectly sanitized path injections. (CVE-2020-25596) Jan Beulich discovered that Xen incorrectly handled validation of event channels. (CVE-2020-25597) Julien Grall and Jan Beulich discovered that Xen incorrectly handled resetting event channels. (CVE-2020-25599) Julien Grall discovered that Xen incorrectly handled event channels memory allocation on 32-bits domains. (CVE-2020-25600) Jan Beulich discovered that Xen incorrectly handled resetting or cleaning up event channels. (CVE-2020-25601) Andrew Cooper discovered that Xen incorrectly handled certain Intel specific MSR (Model Specific Registers). (CVE-2020-25602) Julien Grall discovered that Xen incorrectly handled accessing/allocating event channels. (CVE-2020-25603) Igor Druzhinin discovered that Xen incorrectly handled locks. (CVE-2020-25604) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: libxendevicemodel1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 libxenevtchn1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 libxengnttab1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 libxenmisc4.11 4.11.3+24-g14b62ab3e5-1ubuntu2.3 xen-hypervisor-4.11-amd64 4.11.3+24-g14b62ab3e5-1ubuntu2.3 xen-hypervisor-4.11-arm64 4.11.3+24-g14b62ab3e5-1ubuntu2.3 xen-hypervisor-4.11-armhf 4.11.3+24-g14b62ab3e5-1ubuntu2.3 xen-utils-4.11 4.11.3+24-g14b62ab3e5-1ubuntu2.3 xen-utils-common 4.11.3+24-g14b62ab3e5-1ubuntu2.3 xenstore-utils 4.11.3+24-g14b62ab3e5-1ubuntu2.3 After a standard system update you need to reboot your computer to make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5617-1 CVE-2020-0543, CVE-2020-11739, CVE-2020-11740, CVE-2020-11741, CVE-2020-11742, CVE-2020-11743, CVE-2020-15563, CVE-2020-15564, CVE-2020-15565, CVE-2020-15566, CVE-2020-15567, CVE-2020-25595, CVE-2020-25596, CVE-2020-25597, CVE-2020-25599, CVE-2020-25600, CVE-2020-25601, CVE-2020-25602, CVE-2020-25603, CVE-2020-25604 Package Information: https://launchpad.net/ubuntu/+source/xen/4.11.3+24-g14b62ab3e5-1ubuntu2.3

IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

other

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Gentoo

SOURCES

LAST UPDATE DATE

2024-11-23T19:38:42.393000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE