ZDI-21-195: ISC BIND TKEY Query Heap-based Buffer Overflow Remote Code Execution Vulnerability
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.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ISC BIND 9 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the severity of ZDI-21-195?
ZDI-21-195 is categorized as a high severity vulnerability due to its potential for remote code execution.
How do I fix ZDI-21-195?
To fix ZDI-21-195, update your ISC BIND installation to the latest patched version.
Which versions of ISC BIND are affected by ZDI-21-195?
ZDI-21-195 affects multiple versions of ISC BIND, particularly older versions that do not have the required patches.
Can ZDI-21-195 be exploited without authentication?
Yes, the ZDI-21-195 vulnerability can be exploited by attackers without requiring authentication.
What types of attacks can be executed due to ZDI-21-195?
ZDI-21-195 allows remote attackers to execute arbitrary code, potentially leading to full system compromise.
- agent/references
- agent/type
- agent/title
- agent/severity
- agent/description
- agent/source
- agent/softwarecombine
- agent/tags
- agent/event
- collector/zdi-advisory
- source/ZDI
- alias/ZDI-21-195
- alias/ZDI-CAN-12302
- alias/CVE-2020-8625
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- vendor/isc
- canonical/isc bind 9