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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-20102 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of haproxy as shipped with Red Hat Enterprise Linux 6 and 7.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 6.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | None |
| Availability Impact | Low |
| Platform | Package | State |
|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-haproxy18-haproxy | Affected |
| Red Hat OpenShift Container Platform 3.9 | haproxy | Affected |
| Red Hat OpenShift Container Platform 3.7 | haproxy | Affected |
| Red Hat OpenShift Container Platform 3.11 | haproxy | Affected |
| Red Hat OpenShift Container Platform 3.10 | haproxy | Affected |
| Red Hat Enterprise Linux 7 | haproxy | Not affected |
| Red Hat Enterprise Linux 6 | haproxy | Not affected |
Vulmon