1) Reachable Assertion

Risk: Medium

CVSSv3:
5.7 [CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

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 website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 – Extended Update Support:
7.6

Red Hat Enterprise Linux Server – Update Services for SAP Solutions:
7.6

Red Hat Enterprise Linux Server (for IBM Power LE) – Update Services for SAP Solutions:
7.6

Red Hat Enterprise Linux Server – TUS:
7.6

Red Hat Enterprise Linux for Power, little endian – Extended Update Support:
7.6

Red Hat Enterprise Linux EUS Compute Node:
7.6

Red Hat Enterprise Linux for Power, big endian – Extended Update Support:
7.6

Red Hat Enterprise Linux for IBM z Systems – Extended Update Support:
7.6

Red Hat Enterprise Linux Server – AUS:
7.6

Red Hat Enterprise Linux for IBM System z (Structure A):
7.0

Red Hat Enterprise Linux for Power 9:
7.0

Red Hat Enterprise Linux for ARM 64:
7.0

BIND (Red Hat Inc.):
before 9.9.4-74.el7_6.5

CPE

External links

https://access.redhat.com/errata/RHSA-2020:4992

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

Risk: Medium

CVSSv3:
5.2 [CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

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 website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64 – Extended Update Support:
7.6

Red Hat Enterprise Linux Server – Update Services for SAP Solutions:
7.6

Red Hat Enterprise Linux Server (for IBM Power LE) – Update Services for SAP Solutions:
7.6

Red Hat Enterprise Linux Server – TUS:
7.6

Red Hat Enterprise Linux for Power, little endian – Extended Update Support:
7.6

Red Hat Enterprise Linux EUS Compute Node:
7.6

Red Hat Enterprise Linux for Power, big endian – Extended Update Support:
7.6

Red Hat Enterprise Linux for IBM z Systems – Extended Update Support:
7.6

Red Hat Enterprise Linux Server – AUS:
7.6

Red Hat Enterprise Linux for IBM System z (Structure A):
7.0

Red Hat Enterprise Linux for Power 9:
7.0

Red Hat Enterprise Linux for ARM 64:
7.0

BIND (Red Hat Inc.):
before 9.9.4-74.el7_6.5

CPE

External links

https://access.redhat.com/errata/RHSA-2020:4992

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.



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