Advisory Details

April 30th, 2021

ISC BIND TKEY Query Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-21-502
ZDI-CAN-13506

CVE ID
CVSS SCORE 3.7, (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)
AFFECTED VENDORS ISC
AFFECTED PRODUCTS BIND
VULNERABILITY DETAILS

This vulnerability allows remote attackers to disclose sensitive information 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 user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the "bind" user.

ADDITIONAL DETAILS

Fixed in BIND 9 releases (9.11.31, 9.16.15)


DISCLOSURE TIMELINE
  • 2021-04-22 - Vulnerability reported to vendor
  • 2021-04-30 - Coordinated public release of advisory
CREDIT Anonymous
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