qemu: CVE-2021-20263

Debian Bug report logs - #985083
qemu: CVE-2021-20263

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: qemu: CVE-2021-20263

Date: Fri, 12 Mar 2021 19:33:45 +0100

Source: qemu
Version: 1:5.2+dfsg-6
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for qemu.

CVE-2021-20263[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-20263
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20263
[1] https://www.openwall.com/lists/oss-security/2021/03/08/1
[2] https://git.qemu.org/?p=qemu.git;a=commit;h=e586edcb410543768ef009eaa22a2d9dd4a53846

Regards,
Salvatore

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