QID 356219

Date Published: 2023-09-28

QID 356219: Amazon Linux Security Advisory for haproxy2 : ALASHAPROXY2-2023-002

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. (
( CVE-2018-20102) the upstream bug report describes this issue as follows: an information leak vulnerability was discovered in haproxy 2.1, 2.2 before 2.2.27, 2.3, 2.4 before 2.4.21, 2.5 before 2.5.11, 2.6 before 2.6.8, 2.7 before 2.7.1.
There are 5 bytes left uninitialized in the connection buffer when encoding the fcgi_begin_request record.
Sensitive data may be disclosed to configured fastcgi backends in an unexpected way. (
( CVE-2023-0836)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution
    Please refer to Amazon advisory: ALASHAPROXY2-2023-002 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 356219

    CVE-2023-0836 | CVE-2018-20102 |
    Software Advisories
    Advisory ID Software Component Link
    ALASHAPROXY2-2023-002 amazon linux 2 URL Logo alas.aws.amazon.com/AL2/ALASHAPROXY2-2023-002.html
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