NULL Pointer Dereference Affecting apache2-devel package, versions <2.4.33-3.50.1


Severity

Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
22.64% (97th percentile)

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  • Snyk IDSNYK-SLES150-APACHE2DEVEL-2675056
  • published14 Apr 2022
  • disclosed17 Jun 2021

Introduced: 17 Jun 2021

CVE-2021-31618  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade SLES:15.0 apache2-devel to version 2.4.33-3.50.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream apache2-devel package and not the apache2-devel package as distributed by SLES. See How to fix? for SLES:15.0 relevant fixed versions and status.

Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.

References

CVSS Scores

version 3.1