openEuler update for samba

Published: 2022-01-28

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2021-43566
CWE-ID	CWE-59
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software Subscribe	openEuler Operating systems & Components / Operating system samba-vfs-glusterfs Operating systems & Components / Operating system package or component samba-pidl Operating systems & Components / Operating system package or component samba-dc-provision Operating systems & Components / Operating system package or component libwbclient-devel Operating systems & Components / Operating system package or component samba-winbind-clients Operating systems & Components / Operating system package or component samba-client Operating systems & Components / Operating system package or component libsmbclient Operating systems & Components / Operating system package or component samba-winbind-krb5-locator Operating systems & Components / Operating system package or component python3-samba-dc Operating systems & Components / Operating system package or component samba-krb5-printing Operating systems & Components / Operating system package or component samba-winbind Operating systems & Components / Operating system package or component samba-help Operating systems & Components / Operating system package or component samba-dc Operating systems & Components / Operating system package or component python3-samba-test Operating systems & Components / Operating system package or component samba-winbind-modules Operating systems & Components / Operating system package or component samba-test Operating systems & Components / Operating system package or component samba-common Operating systems & Components / Operating system package or component samba-dc-bind-dlz Operating systems & Components / Operating system package or component samba-debugsource Operating systems & Components / Operating system package or component libwbclient Operating systems & Components / Operating system package or component samba-debuginfo Operating systems & Components / Operating system package or component samba-common-tools Operating systems & Components / Operating system package or component ctdb Operating systems & Components / Operating system package or component python3-samba Operating systems & Components / Operating system package or component samba-libs Operating systems & Components / Operating system package or component ctdb-tests Operating systems & Components / Operating system package or component samba-devel Operating systems & Components / Operating system package or component libsmbclient-devel Operating systems & Components / Operating system package or component samba Operating systems & Components / Operating system package or component
Vendor	openEuler

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Link following

EUVDB-ID: #VU59345

Risk: Low

CVSSv3.1: 2.3 [CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-43566

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to a symlink race condition when creating directories. A remote authenticated user can use SMB1 or NFS symlink race to create directories on the Unix filesystem outside of the share definition.

Successful exploitation of the vulnerability requites that the user has permissions to create folder in the target directory.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP1 - 20.03 LTS SP3

samba-vfs-glusterfs: before 4.11.12-9

samba-pidl: before 4.11.12-9

samba-dc-provision: before 4.11.12-9

libwbclient-devel: before 4.11.12-9

samba-winbind-clients: before 4.11.12-9

samba-client: before 4.11.12-9

libsmbclient: before 4.11.12-9

samba-winbind-krb5-locator: before 4.11.12-9

python3-samba-dc: before 4.11.12-9

samba-krb5-printing: before 4.11.12-9

samba-winbind: before 4.11.12-9

samba-help: before 4.11.12-9

samba-dc: before 4.11.12-9

python3-samba-test: before 4.11.12-9

samba-winbind-modules: before 4.11.12-9

samba-test: before 4.11.12-9

samba-common: before 4.11.12-9

samba-dc-bind-dlz: before 4.11.12-9

samba-debugsource: before 4.11.12-9

libwbclient: before 4.11.12-9

samba-debuginfo: before 4.11.12-9

samba-common-tools: before 4.11.12-9

ctdb: before 4.11.12-9

python3-samba: before 4.11.12-9

samba-libs: before 4.11.12-9

ctdb-tests: before 4.11.12-9

samba-devel: before 4.11.12-9

libsmbclient-devel: before 4.11.12-9

samba: before 4.11.12-9

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2022-1507

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.