CVE-2018-20102 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

http://git.haproxy.org/?p=haproxy.git;a=commit;h=efbbdf72992cd20458259962346044cafd9331c0 http://www.securityfocus.com/bid/106223 https://access.redhat.com/errata/RHBA-2019:0326 https://access.redhat.com/errata/RHBA-2019:0327 https://access.redhat.com/errata/RHSA-2019:1436 https://usn.ubuntu.com/3858-1/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5