NULL Pointer Dereference Affecting mod_ssl package, versions <1:2.4.34-1.amzn2.1.0

Q: How to fix?

Upgrade Amazon-Linux:2 mod_ssl to version 1:2.4.34-1.amzn2.1.0 or higher. This issue was patched in ALAS2-2018-1062 .

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Proof of Concept

56.04% (99^th percentile)

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Snyk IDSNYK-AMZN2-MODSSL-1665138
published27 Sept 2021
disclosed18 Jul 2018

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Introduced: 18 Jul 2018

CVE-2018-8011 (opens in a new tab) CWE-476 (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 mod_ssl to version 1:2.4.34-1.amzn2.1.0 or higher.
This issue was patched in ALAS2-2018-1062.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mod_ssl package and not the mod_ssl package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

By specially crafting HTTP requests, the mod_md challenge handler would dereference a NULL pointer and cause the child process to segfault. This could be used to DoS the server. Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.33).