openEuler 20.03 LTS SP1 update for samba

Published: 2021-06-07

Risk	High
Patch available	YES
Number of vulnerabilities	3
CVE-ID	CVE-2021-20254 CVE-2021-20277 CVE-2020-27840
CWE-ID	CWE-125 CWE-122
Exploitation vector	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-libs Operating systems & Components / Operating system package or component samba-dc-bind-dlz Operating systems & Components / Operating system package or component samba-winbind-krb5-locator Operating systems & Components / Operating system package or component samba-devel Operating systems & Components / Operating system package or component samba-winbind-clients Operating systems & Components / Operating system package or component libsmbclient Operating systems & Components / Operating system package or component samba-common-tools Operating systems & Components / Operating system package or component samba-krb5-printing Operating systems & Components / Operating system package or component libwbclient-devel Operating systems & Components / Operating system package or component ctdb Operating systems & Components / Operating system package or component samba-common Operating systems & Components / Operating system package or component samba-dc Operating systems & Components / Operating system package or component python3-samba Operating systems & Components / Operating system package or component samba-debugsource 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-help Operating systems & Components / Operating system package or component libwbclient Operating systems & Components / Operating system package or component samba-client Operating systems & Components / Operating system package or component samba-dc-provision Operating systems & Components / Operating system package or component ctdb-tests Operating systems & Components / Operating system package or component samba-debuginfo Operating systems & Components / Operating system package or component python3-samba-test Operating systems & Components / Operating system package or component python3-samba-dc Operating systems & Components / Operating system package or component samba-winbind 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 information about 3 vulnerabilities.

1) Out-of-bounds read

EUVDB-ID: #VU52748

Risk: Medium

CVSSv3.1: 4 [CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20254

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when mapping Windows group identities (SIDs) into unix group identities (gids), which resulted into negative idmap cache entries created in the Samba server process token. An attacker who can manage to trigger the vulnerability can crash the Samba server or potentially perform unauthorized actions on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP1

samba-vfs-glusterfs: before 4.11.12-4

samba-pidl: before 4.11.12-4

samba-libs: before 4.11.12-4

samba-dc-bind-dlz: before 4.11.12-4

samba-winbind-krb5-locator: before 4.11.12-4

samba-devel: before 4.11.12-4

samba-winbind-clients: before 4.11.12-4

libsmbclient: before 4.11.12-4

samba-common-tools: before 4.11.12-4

samba-krb5-printing: before 4.11.12-4

libwbclient-devel: before 4.11.12-4

ctdb: before 4.11.12-4

samba-common: before 4.11.12-4

samba-dc: before 4.11.12-4

python3-samba: before 4.11.12-4

samba-debugsource: before 4.11.12-4

samba-winbind-modules: before 4.11.12-4

samba-test: before 4.11.12-4

samba-help: before 4.11.12-4

libwbclient: before 4.11.12-4

samba-client: before 4.11.12-4

samba-dc-provision: before 4.11.12-4

ctdb-tests: before 4.11.12-4

samba-debuginfo: before 4.11.12-4

python3-samba-test: before 4.11.12-4

python3-samba-dc: before 4.11.12-4

samba-winbind: before 4.11.12-4

libsmbclient-devel: before 4.11.12-4

samba: before 4.11.12-4

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1207

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.

2) Out-of-bounds read

EUVDB-ID: #VU51701

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20277

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in ldb_handler_fold() function when processing multiple consecutive leading spaces within LDAP query. A remote user can send a specially crafted LDAP query, trigger out-of-bounds read error and crash the LDAP server.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP1

samba-vfs-glusterfs: before 4.11.12-4

samba-pidl: before 4.11.12-4

samba-libs: before 4.11.12-4

samba-dc-bind-dlz: before 4.11.12-4

samba-winbind-krb5-locator: before 4.11.12-4

samba-devel: before 4.11.12-4

samba-winbind-clients: before 4.11.12-4

libsmbclient: before 4.11.12-4

samba-common-tools: before 4.11.12-4

samba-krb5-printing: before 4.11.12-4

libwbclient-devel: before 4.11.12-4

ctdb: before 4.11.12-4

samba-common: before 4.11.12-4

samba-dc: before 4.11.12-4

python3-samba: before 4.11.12-4

samba-debugsource: before 4.11.12-4

samba-winbind-modules: before 4.11.12-4

samba-test: before 4.11.12-4

samba-help: before 4.11.12-4

libwbclient: before 4.11.12-4

samba-client: before 4.11.12-4

samba-dc-provision: before 4.11.12-4

ctdb-tests: before 4.11.12-4

samba-debuginfo: before 4.11.12-4

python3-samba-test: before 4.11.12-4

python3-samba-dc: before 4.11.12-4

samba-winbind: before 4.11.12-4

libsmbclient-devel: before 4.11.12-4

samba: before 4.11.12-4

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1207

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

3) Heap-based buffer overflow

EUVDB-ID: #VU51702

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-27840

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing DNs inside bind requests. A remote attacker can send specially crafted LDAP request to Samba AD DC LDAP server, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP1

samba-vfs-glusterfs: before 4.11.12-4

samba-pidl: before 4.11.12-4

samba-libs: before 4.11.12-4

samba-dc-bind-dlz: before 4.11.12-4

samba-winbind-krb5-locator: before 4.11.12-4

samba-devel: before 4.11.12-4

samba-winbind-clients: before 4.11.12-4

libsmbclient: before 4.11.12-4

samba-common-tools: before 4.11.12-4

samba-krb5-printing: before 4.11.12-4

libwbclient-devel: before 4.11.12-4

ctdb: before 4.11.12-4

samba-common: before 4.11.12-4

samba-dc: before 4.11.12-4

python3-samba: before 4.11.12-4

samba-debugsource: before 4.11.12-4

samba-winbind-modules: before 4.11.12-4

samba-test: before 4.11.12-4

samba-help: before 4.11.12-4

libwbclient: before 4.11.12-4

samba-client: before 4.11.12-4

samba-dc-provision: before 4.11.12-4

ctdb-tests: before 4.11.12-4

samba-debuginfo: before 4.11.12-4

python3-samba-test: before 4.11.12-4

python3-samba-dc: before 4.11.12-4

samba-winbind: before 4.11.12-4

libsmbclient-devel: before 4.11.12-4

samba: before 4.11.12-4

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1207

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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