CVE-2018-20102
Publication date 12 December 2018
Last updated 25 August 2025
Ubuntu priority
Description
An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might be able read the 16 bytes corresponding to an AAAA record from the non-initialized part of the buffer, possibly accessing anything that was left on the stack, or even past the end of the 8193-byte buffer, depending on the value of accepted_payload_size.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| haproxy | ||
| 18.04 LTS bionic |
Fixed 1.8.8-1ubuntu0.3
|
|
| 16.04 LTS xenial |
Fixed 1.6.3-1ubuntu0.2
|
|
| 14.04 LTS trusty | Not in release |
Patch details
| Package | Patch details |
|---|---|
| haproxy |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.5 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-3858-1
- HAProxy vulnerabilities
- 15 January 2019