Vulnerability Details CVE-2021-20263
A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 7.1%
CVSS Severity
CVSS v3 Score 3.3
CVSS v2 Score 2.1
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1933668
- https://security.gentoo.org/glsa/202208-27
- https://security.netapp.com/advisory/ntap-20210507-0002/
- https://www.openwall.com/lists/oss-security/2021/03/08/1
- https://bugzilla.redhat.com/show_bug.cgi?id=1933668
- https://security.gentoo.org/glsa/202208-27
- https://security.netapp.com/advisory/ntap-20210507-0002/
- https://www.openwall.com/lists/oss-security/2021/03/08/1
Products affected by CVE-2021-20263
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cpe:2.3:a:qemu:qemu:5.0.0
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cpe:2.3:a:qemu:qemu:5.0.1
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cpe:2.3:a:qemu:qemu:5.1.0
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cpe:2.3:a:qemu:qemu:5.1.1
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cpe:2.3:a:qemu:qemu:5.2.0