Heap information disclosure via zone parsing
Published Jan 21, 2022 · Updated Aug 4, 2024
Out-of-bounds read in ldns 1.7.1 allows remote attackers to disclose heap information by supplying a crafted zone file for verification. The ldns_rr_new_frm_str_internal parser advances and dereferences its buffer without first confirming remaining input, so a malformed record can read past the heap allocation. Exploitation requires a verifier to process attacker-controlled zone data, and the demonstrated consequence is information disclosure without integrity or availability impact.
Summary
What happened
Out-of-bounds read in ldns 1.7.1 allows remote attackers to disclose heap information by supplying a crafted zone file for verification. The ldns_rr_new_frm_str_internal parser advances and dereferences its buffer without first confirming remaining input, so a malformed record can read past the heap allocation. Exploitation requires a verifier to process attacker-controlled zone data, and the demonstrated consequence is information disclosure without integrity or availability impact.
The record
- CVE
- CVE-2020-19860
- Published
- Jan 21, 2022
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-125, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 21, 2022CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo