var-202004-0465
Vulnerability from variot
An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain. Xen Is vulnerable to handling exceptional conditions.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-----
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"data": "An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain. Xen Is vulnerable to handling exceptional conditions.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. \n\r\n\r\nThere are security vulnerabilities in Xen 4.13.x and previous versions. An attacker can use this vulnerability to cause a denial of service. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\nGentoo Linux Security Advisory GLSA 202005-08\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n https://security.gentoo.org/\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\n Severity: Normal\n Title: Xen: Multiple vulnerabilities\n Date: May 14, 2020\n Bugs: #717446\n ID: 202005-08\n\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\nSynopsis\n========\n\nMultiple vulnerabilities have been found in Xen, the worst of which\ncould allow privilege escalation. \n\nBackground\n==========\n\nXen is a bare-metal hypervisor. \n\nAffected packages\n=================\n\n -------------------------------------------------------------------\n Package / Vulnerable / Unaffected\n -------------------------------------------------------------------\n 1 app-emulation/xen \u003c 4.12.2-r2 \u003e= 4.12.2-r2\n 2 app-emulation/xen-tools \u003c 4.12.2-r2 \u003e= 4.12.2-r2\n -------------------------------------------------------------------\n 2 affected packages\n\nDescription\n===========\n\nMultiple vulnerabilities have been discovered in Xen. Please review the\nCVE identifiers referenced below for details. \n\nImpact\n======\n\nPlease review the referenced CVE identifiers for details. \n\nWorkaround\n==========\n\nThere is no known workaround at this time. \n\nResolution\n==========\n\nAll Xen users should upgrade to the latest version:\n\n # emerge --sync\n # emerge --ask --oneshot --verbose \"\u003e=app-emulation/xen-4.12.2-r2\"\n\nReferences\n==========\n\n[ 1 ] CVE-2020-11739\n https://nvd.nist.gov/vuln/detail/CVE-2020-11739\n[ 2 ] CVE-2020-11740\n https://nvd.nist.gov/vuln/detail/CVE-2020-11740\n[ 3 ] CVE-2020-11741\n https://nvd.nist.gov/vuln/detail/CVE-2020-11741\n[ 4 ] CVE-2020-11742\n https://nvd.nist.gov/vuln/detail/CVE-2020-11742\n[ 5 ] CVE-2020-11743\n https://nvd.nist.gov/vuln/detail/CVE-2020-11743\n\nAvailability\n============\n\nThis GLSA and any updates to it are available for viewing at\nthe Gentoo Security Website:\n\n https://security.gentoo.org/glsa/202005-08\n\nConcerns?\n=========\n\nSecurity is a primary focus of Gentoo Linux and ensuring the\nconfidentiality and security of our users\u0027 machines is of utmost\nimportance to us. Any security concerns should be addressed to\nsecurity@gentoo.org or alternatively, you may file a bug at\nhttps://bugs.gentoo.org. \n\nLicense\n=======\n\nCopyright 2020 Gentoo Foundation, Inc; referenced text\nbelongs to its owner(s). \n\nThe contents of this document are licensed under the\nCreative Commons - Attribution / Share Alike license. \n\nhttps://creativecommons.org/licenses/by-sa/2.5\n. \n \nFor the stable distribution (buster), these problems have been fixed in\nversion 4.11.4+24-gddaaccbbab-1~deb10u1. \n\nWe recommend that you upgrade your xen packages. \n\nFor the detailed security status of xen please refer to\nits security tracker page at:\nhttps://security-tracker.debian.org/tracker/xen\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org\n-----BEGIN PGP SIGNATURE-----\n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\ng8OhDVMgrx5GM4rXSZ60J6uxkd2eUns4Ud8pDGG8XTpnRBxD8Kk=\n=tfm7\n-----END PGP SIGNATURE-----\n",
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