ID CVE-2021-31618
Summary 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
Vulnerable Configurations
  • cpe:2.3:a:apache:http_server:1.15.17:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:1.15.17:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.47:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.47:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
    cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
    cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*
    cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*
    cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*
    cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*
  • cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
    cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
CVSS
Base: 5.0 (as of 10-12-2021 - 17:05)
Impact:
Exploitability:
CWE CWE-476
CAPEC
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
NONE NONE PARTIAL
cvss-vector via4 AV:N/AC:L/Au:N/C:N/I:N/A:P
Last major update 10-12-2021 - 17:05
Published 15-06-2021 - 09:15
Last modified 10-12-2021 - 17:05
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