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CVE-2018-20102

Published: 12 December 2018

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
haproxy
Launchpad, Ubuntu, Debian
upstream
Released (1.8.15-1)
trusty Does not exist
(trusty was not-affected [code not present])
xenial
Released (1.6.3-1ubuntu0.2)
bionic
Released (1.8.8-1ubuntu0.3)
cosmic
Released (1.8.13-2ubuntu0.1)
Patches:
upstream: http://git.haproxy.org/?p=haproxy.git;a=commit;h=efbbdf72992cd20458259962346044cafd9331c0

Severity score breakdown

Parameter Value
Base score 7.5
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