Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
EUVDB-ID: #VU60004
Risk: Low
CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3995
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local user to bypass implemented security restrictions.
The vulnerability exists due to improper parsing of the /proc/self/mountinfo file in libmount. A local user can unmount other user's filesystems that are either world-writable themselves or mounted in a world-writable directory.
Install updates from vendor's repository.
Vulnerable software versionsopenEuler: 20.03 LTS SP1 - 20.03 LTS SP3
util-linux-help: before 2.35.2-10
libfdisk: before 2.35.2-10
util-linux-user: before 2.35.2-10
libsmartcols: before 2.35.2-10
util-linux-debugsource: before 2.35.2-10
uuidd: before 2.35.2-10
util-linux-debuginfo: before 2.35.2-10
util-linux-devel: before 2.35.2-10
libmount: before 2.35.2-10
libuuid: before 2.35.2-10
python-libmount: before 2.35.2-10
libblkid: before 2.35.2-10
util-linux: before 2.35.2-10
External linkshttp://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2022-1536
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
EUVDB-ID: #VU60005
Risk: Low
CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3996
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local user to bypass implemented security restrictions.
The vulnerability exists due to improper UID check in libmount. A local user can unmount FUSE filesystems of users with similar UID.
Install updates from vendor's repository.
Vulnerable software versionsopenEuler: 20.03 LTS SP1 - 20.03 LTS SP3
util-linux-help: before 2.35.2-10
libfdisk: before 2.35.2-10
util-linux-user: before 2.35.2-10
libsmartcols: before 2.35.2-10
util-linux-debugsource: before 2.35.2-10
uuidd: before 2.35.2-10
util-linux-debuginfo: before 2.35.2-10
util-linux-devel: before 2.35.2-10
libmount: before 2.35.2-10
libuuid: before 2.35.2-10
python-libmount: before 2.35.2-10
libblkid: before 2.35.2-10
util-linux: before 2.35.2-10
External linkshttp://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2022-1536
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.