Red Hat Enterprise Linux 7.4 update for bind



Published: 2021-05-03
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-25215
CWE ID CWE-617
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Red Hat Enterprise Linux Server - Update Services for SAP Solutions
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions
Operating systems & Components / Operating system package or component

BIND (Red Hat Inc.)
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux Server - TUS
Operating systems & Components / Operating system

Red Hat Enterprise Linux Server - AUS
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Reachable Assertion

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-25215

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 DNAME records. A remote attacker can force named to add the same RRset to the ANSWER section more than once, trigger an assertion failure and crash the service. Both authoritative and recursive servers are affected by this issue during zone transfers.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Server - Update Services for SAP Solutions: 7.4

Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions: 7.4

Red Hat Enterprise Linux Server - TUS: 7.4

Red Hat Enterprise Linux Server - AUS: 7.4

BIND (Red Hat Inc.): before 9.9.4-51.el7_4.6

CPE External links

https://access.redhat.com/errata/RHSA-2021:1479

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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