-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
Null pointer dereference in h2 fuzzing (CVE-2021-41524)
6 October 2021
AusCERT Security Bulletin Summary
Product: Apache HTTP Server
Publisher: Apache Software Foundation
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2021-41524
- --------------------------BEGIN INCLUDED TEXT--------------------
While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected
during HTTP/2 request processing,allowing an external source to DoS the server.
This requires a specially crafted request.
The vulnerability was recently introduced in version 2.4.49. No exploit is
known to the project.
Disable the HTTP/2 protocol.
Apache httpd team would like to thank LI ZHI XIN from NSFocus Security Team
for reporting this issue.
Reported to security team 2021-09-17
fixed by r1893655 in 2.4.x 2021-09-26
Update 2.4.50 released 2021-10-04
Fixed in Apache HTTP Server 2.4.50
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to email@example.com
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----