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CVE-2023-46724

Public on 2023-11-01
Modified on 2024-02-09
Description

When Squid is compiled with SSL support (i.e. where it can encrypt/decrypt requests/responses rather than using a CONNECT tunnel), the function check_domain is used to check whether a request domain's name is the same domain (or is equally valid) as in the certificate the server offers. While zero-length domains are rejected before the matchDomainName function as called from check_domain is ever called, if a certificate offers the CNAME as simply * (which would mean all domains), a pointer pointing to an empty/null character is passed to matchDomainName which can either produce junk data, or can cause a crash; or do nothing as it is undefined behavior.

Severity
Important
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CVSS v3 Base Score
7.5
See breakdown
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 squid 2023-11-10 17:32 ALAS-2023-1886
Amazon Linux 2 - Core squid 2023-11-29 22:19 ALAS2-2023-2354
Amazon Linux 2023 squid 2023-11-09 21:29 ALAS2023-2023-429

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv3 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H