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CVE-2020-11742

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.

Risk Information

Base Score
5.5
MODERATE
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS Score
Exploitation Probability
0.091

Associated Vulnerability

VulnerabilityOS Platform
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-debugsource-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-doc-html-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-libs-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-libs-32bit-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-libs-debuginfo-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-libs-debuginfo-32bit-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-tools-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-tools-debuginfo-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-tools-domU-4.11.3_04-2.23.1.x86_64.rpmLinux
SUSE-SU-2020:1138-1(SUSE Linux Enterprise Server 12-SP4 ) xen-tools-domU-debuginfo-4.11.3_04-2.23.1.x86_64.rpmLinux
Public headers and libs for Xen (USN-5617-1) libxenevtchn1_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) libxengnttab1_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) libxenmisc4.11_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) xen-utils-4.11_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) xenstore-utils_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) xen-utils-common_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) libxendevicemodel1_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) xen-hypervisor-4.11-amd64_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234