oss-security - CVE-2020-35452: Apache httpd: mod_auth_digest possible stack overflow by one nul byte

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Date: Wed, 09 Jun 2021 23:11:00 +0200
From: Christophe JAILLET <jailletc36@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2020-35452: Apache httpd: mod_auth_digest possible stack overflow by one nul byte

CVE-2020-35452: mod_auth_digest possible stack overflow by one nul byte

Severity: low

Vendor: The Apache Software Foundation

Versions Affected:
httpd 2.4.0 to 2.4.46

Description:
Apache HTTP Server 2.4.0 to 2.4.46
A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow

Mitigation:
None

Credit:
This issue was discovered and reported by GHSL team member @antonio-morales (Antonio Morales)

References:
https://httpd.apache.org/security/vulnerabilities_24.html

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