openEuler 20.03 LTS update for bind

Published: 2020-11-10

Risk	Medium
Patch available	YES
Number of vulnerabilities	3
CVE-ID	CVE-2020-8622 CVE-2020-8623 CVE-2020-8624
CWE-ID	CWE-617 CWE-264
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	openEuler Operating systems & Components / Operating system bind-utils Operating systems & Components / Operating system package or component bind-sdb-chroot Operating systems & Components / Operating system package or component bind-sdb Operating systems & Components / Operating system package or component bind-pkcs11-devel Operating systems & Components / Operating system package or component bind-pkcs11 Operating systems & Components / Operating system package or component bind-libs-lite Operating systems & Components / Operating system package or component bind-libs Operating systems & Components / Operating system package or component bind-export-libs Operating systems & Components / Operating system package or component bind-export-devel Operating systems & Components / Operating system package or component bind-devel Operating systems & Components / Operating system package or component bind-debugsource Operating systems & Components / Operating system package or component bind-debuginfo Operating systems & Components / Operating system package or component bind-chroot Operating systems & Components / Operating system package or component python3-bind Operating systems & Components / Operating system package or component bind Operating systems & Components / Operating system package or component
Vendor	openEuler

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Reachable Assertion

EUVDB-ID: #VU45819

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-2020-8622

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due to a reachable assertion when handling TSIG-signed request. An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS

bind-utils: before 9.11.21-3

bind-sdb-chroot: before 9.11.21-3

bind-sdb: before 9.11.21-3

bind-pkcs11-devel: before 9.11.21-3

bind-pkcs11: before 9.11.21-3

bind-libs-lite: before 9.11.21-3

bind-libs: before 9.11.21-3

bind-export-libs: before 9.11.21-3

bind-export-devel: before 9.11.21-3

bind-devel: before 9.11.21-3

bind-debugsource: before 9.11.21-3

bind-debuginfo: before 9.11.21-3

bind-chroot: before 9.11.21-3

python3-bind: before 9.11.21-3

bind: before 9.11.21-3

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2020-1081

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.

2) Reachable Assertion

EUVDB-ID: #VU45818

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8623

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due to a reachable assertion when processing DNS query for a zone signed with RSA. A remote attacker can send a specially crafted query and crash the DNS server.

Successful exploitation of the vulnerability requires that BIND is built with "--enable-native-pkcs11".

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS

bind-utils: before 9.11.21-3

bind-sdb-chroot: before 9.11.21-3

bind-sdb: before 9.11.21-3

bind-pkcs11-devel: before 9.11.21-3

bind-pkcs11: before 9.11.21-3

bind-libs-lite: before 9.11.21-3

bind-libs: before 9.11.21-3

bind-export-libs: before 9.11.21-3

bind-export-devel: before 9.11.21-3

bind-devel: before 9.11.21-3

bind-debugsource: before 9.11.21-3

bind-debuginfo: before 9.11.21-3

bind-chroot: before 9.11.21-3

python3-bind: before 9.11.21-3

bind: before 9.11.21-3

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2020-1081

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.

3) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU45817

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8624

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote user to perform unauthorized actions.

The vulnerability exists due to change 4885 in BIND inadvertently caused "update-policy" rules of type "subdomain" to be treated as if they were of type "zonesub", allowing updates to all parts of the zone along with the intended subdomain. A remote user with privileges to change a specific subset of the zone's content could abuse these unintended additional privileges to update other contents of the zone.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS

bind-utils: before 9.11.21-3

bind-sdb-chroot: before 9.11.21-3

bind-sdb: before 9.11.21-3

bind-pkcs11-devel: before 9.11.21-3

bind-pkcs11: before 9.11.21-3

bind-libs-lite: before 9.11.21-3

bind-libs: before 9.11.21-3

bind-export-libs: before 9.11.21-3

bind-export-devel: before 9.11.21-3

bind-devel: before 9.11.21-3

bind-debugsource: before 9.11.21-3

bind-debuginfo: before 9.11.21-3

bind-chroot: before 9.11.21-3

python3-bind: before 9.11.21-3

bind: before 9.11.21-3

External links

http://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2020-1081

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.