Advisory Details

February 24th, 2021

ISC BIND TKEY Query Heap-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-21-195
ZDI-CAN-12302

CVE ID CVE-2020-8625
CVSS SCORE 8.1, AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS ISC
AFFECTED PRODUCTS BIND
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of ISC BIND. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of TKEY queries. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the "bind" user.

ADDITIONAL DETAILS

  https://kb.isc.org/docs/cve-2020-8625


DISCLOSURE TIMELINE
  • 2020-12-16 - Vulnerability reported to vendor
  • 2021-02-24 - Coordinated public release of advisory
CREDIT Anonymous
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