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OVAL Definitions
>
OVAL Definition Details
Id
oval:ru.altx-soft.nix:def:152368
[Eng]
Version
6
Class
vulnerability
ALTXid
354639
Language
Russian
Severity
Medium
Title
SLES -- уязвимость в Linux kernel (CVE-2020-16120)
Description
В продукте Linux kernel обнаружена уязвимость CVE-2020-16120.
Family
unix
Platform
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 12-LTSS
SUSE Linux Enterprise Server 15-LTSS
SUSE Linux Enterprise Server for SAP 12
SUSE Linux Enterprise Server for SAP 15
Product
Linux kernel
Reference
FSTEC: BDU:2020-05795
FSTEC: BDU:2020-05795
Id:
BDU:2020-05795
Reference:
https://bdu.fstec.ru/vul/2020-05795
CVE: CVE-2020-16120
CVE: CVE-2020-16120
Id:
CVE-2020-16120
Reference:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-16120
Comment
: Overlayfs did not properly perform permission checking when copying up files in an overlayfs and could be exploited from within a user namespace, if, for example, unprivileged user namespaces were allowed. It was possible to have a file not readable by an unprivileged user to be copied to a mountpoint controlled by the user, like a removable device. This was introduced in kernel version 4.19 by commit d1d04ef ("ovl: stack file ops"). This was fixed in kernel version 5.8 by commits 56230d9 ("ovl: verify permissions in ovl_path_open()"), 48bd024 ("ovl: switch to mounter creds in readdir") and 05acefb ("ovl: check permission to open real file"). Additionally, commits 130fdbc ("ovl: pass correct flags for opening real directory") and 292f902 ("ovl: call secutiry hook in ovl_real_ioctl()") in kernel 5.8 might also be desired or necessary. These additional commits introduced a regression in overlay mounts within user namespaces which prevented access to files with ownership outside of the user namespace. This regression was mitigated by subsequent commit b6650da ("ovl: do not fail because of O_NOATIMEi") in kernel 5.11.
CVSSv2 Score:
2.1
Access vector:
LOCAL
Access complexity:
LOW
Authentication:
NONE
Confidentiality impact:
PARTIAL
Integrity impact:
NONE
Availability impact:
NONE
CVSSv2 Vector:
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSSv3 Score:
4.4
Attack vector:
LOCAL
Attack complexity:
LOW
Privileges required:
HIGH
User interaction:
NONE
Scope:
UNCHANGED
Confidentiality impact:
HIGH
Integrity impact:
NONE
Availability impact:
NONE
CVSSv3 Vector:
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CWE:
CWE-Other ()
References:
https://git.kernel.org/linus/b6650dab404c701d7fe08a108b746542a934da84 (CONFIRM)
https://launchpad.net/bugs/1894980 (UBUNTU)
https://ubuntu.com/USN-4578-1 (UBUNTU)
https://www.openwall.com/lists/oss-security/2020/10/14/2 (CONFIRM)
https://launchpad.net/bugs/1900141 (UBUNTU)
https://ubuntu.com/USN-4576-1 (UBUNTU)
https://git.kernel.org/linus/56230d956739b9cb1cbde439d76227d77979a04d (CONFIRM)
https://git.kernel.org/linus/d1d04ef8572bc8c22265057bd3d5a79f223f8f52 (CONFIRM)
https://ubuntu.com/USN-4577-1 (UBUNTU)
https://git.kernel.org/linus/48bd024b8a40d73ad6b086de2615738da0c7004f (CONFIRM)
https://git.kernel.org/linus/05acefb4872dae89e772729efb194af754c877e8 (CONFIRM)
VENDOR: SUSE-SU-2020:3532-1
VENDOR: SUSE-SU-2020:3532-1
Id:
SUSE-SU-2020:3532-1
Reference:
https://www.suse.com/support/update/announcement/2020/SUSE-SU-20203532-1/
VENDOR: SUSE-SU-2020:3544-1
VENDOR: SUSE-SU-2020:3544-1
Id:
SUSE-SU-2020:3544-1
Reference:
https://www.suse.com/support/update/announcement/2020/SUSE-SU-20203544-1/
VENDOR: SUSE-SU-2020:3281-1
VENDOR: SUSE-SU-2020:3281-1
Id:
SUSE-SU-2020:3281-1
Reference:
https://www.suse.com/support/update/announcement/2020/SUSE-SU-20203281-1/
VENDOR: SUSE-SU-2020:3326-1
VENDOR: SUSE-SU-2020:3326-1
Id:
SUSE-SU-2020:3326-1
Reference:
https://www.suse.com/support/update/announcement/2020/SUSE-SU-20203326-1/
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