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AUSCERT External Security Bulletin Redistribution
ESB-2021.2196
USN-4994-1: Apache HTTP Server vulnerabilities
22 June 2021
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AusCERT Security Bulletin Summary
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Product: Apache HTTP Server
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands — Remote/Unauthenticated
Denial of Service — Remote/Unauthenticated
Access Confidential Data — Remote/Unauthenticated
Reduced Security — Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-30641 CVE-2021-26691 CVE-2021-26690
CVE-2020-35452 CVE-2020-13950
Reference: ESB-2021.2153
ESB-2021.2097
Original Bulletin:
https://ubuntu.com/security/notices/USN-4994-1
https://ubuntu.com/security/notices/USN-4994-2
Comment: This bulletin contains two (2) Ubuntu security advisories.
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USN-4994-1: Apache HTTP Server vulnerabilities
21 June 2021
Several security issues were fixed in Apache HTTP Server.
Releases
o Ubuntu 21.04
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o apache2 – Apache HTTP server
Details
Marc Stern discovered that the Apache mod_proxy_http module incorrectly
handled certain requests. A remote attacker could possibly use this issue
to cause Apache to crash, resulting in a denial of service. This issue only
affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. ( CVE-2020-13950 )
Antonio Morales discovered that the Apache mod_auth_digest module
incorrectly handled certain Digest nonces. A remote attacker could possibly
use this issue to cause Apache to crash, resulting in a denial of service.
( CVE-2020-35452 )
Antonio Morales discovered that the Apache mod_session module incorrectly
handled certain Cookie headers. A remote attacker could possibly use this
issue to cause Apache to crash, resulting in a denial of service.
( CVE-2021-26690 )
Christophe Jaillet discovered that the Apache mod_session module
incorrectly handled certain SessionHeader values. A remote attacker could
use this issue to cause Apache to crash, resulting in a denial of service,
or possibly execute arbitrary code. ( CVE-2021-26691 )
Christoph Anton Mitterer discovered that the new MergeSlashes configuration
option resulted in unexpected behaviour in certain situations.
( CVE-2021-30641 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o apache2 – 2.4.46-4ubuntu1.1
o apache2-bin – 2.4.46-4ubuntu1.1
Ubuntu 20.10
o apache2 – 2.4.46-1ubuntu1.2
o apache2-bin – 2.4.46-1ubuntu1.2
Ubuntu 20.04
o apache2 – 2.4.41-4ubuntu3.3
o apache2-bin – 2.4.41-4ubuntu3.3
Ubuntu 18.04
o apache2 – 2.4.29-1ubuntu4.16
o apache2-bin – 2.4.29-1ubuntu4.16
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-26691
o CVE-2021-26690
o CVE-2020-35452
o CVE-2021-30641
o CVE-2020-13950
Related notices
o USN-4994-2 : apache2-utils, apache2-mpm-itk, apache2-mpm-prefork,
apache2-dev, apache2-data, apache2-suexec-pristine, apache2-mpm-worker,
apache2.2-bin, libapache2-mod-proxy-html, apache2-suexec-custom,
libapache2-mod-macro, apache2-doc, apache2-bin, apache2-suexec, apache2,
apache2-mpm-event
– ——————————————————————————
USN-4994-2: Apache HTTP Server vulnerabilities
21 June 2021
Several security issues were fixed in Apache HTTP Server.
Releases
o Ubuntu 16.04 ESM
o Ubuntu 14.04 ESM
Packages
o apache2 – Apache HTTP server
Details
USN-4994-1 fixed several vulnerabilities in Apache. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
Original advisory details:
Antonio Morales discovered that the Apache mod_auth_digest module
incorrectly handled certain Digest nonces. A remote attacker could possibly
use this issue to cause Apache to crash, resulting in a denial of service.
( CVE-2020-35452 )
Antonio Morales discovered that the Apache mod_session module incorrectly
handled certain Cookie headers. A remote attacker could possibly use this
issue to cause Apache to crash, resulting in a denial of service.
( CVE-2021-26690 )
Christophe Jaillet discovered that the Apache mod_session module
incorrectly handled certain SessionHeader values. A remote attacker could
use this issue to cause Apache to crash, resulting in a denial of service,
or possibly execute arbitrary code. ( CVE-2021-26691 )
Christoph Anton Mitterer discovered that the new MergeSlashes configuration
option resulted in unexpected behaviour in certain situations.
( CVE-2021-30641 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o apache2 – 2.4.18-2ubuntu3.17+esm1
Available with UA Infra or UA Desktop
o apache2-bin – 2.4.18-2ubuntu3.17+esm1
Available with UA Infra or UA Desktop
Ubuntu 14.04
o apache2 – 2.4.7-1ubuntu4.22+esm1
Available with UA Infra or UA Desktop
o apache2-bin – 2.4.7-1ubuntu4.22+esm1
Available with UA Infra or UA Desktop
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-26691
o CVE-2020-35452
o CVE-2021-30641
o CVE-2021-26690
Related notices
o USN-4994-1 : apache2-utils, apache2-dev, apache2-data,
apache2-suexec-pristine, libapache2-mod-md, apache2-suexec-custom,
libapache2-mod-proxy-uwsgi, apache2-doc, apache2-bin, apache2,
apache2-ssl-dev
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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
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NOTE: This is only the original release of the security bulletin. It may
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Previous advisories and external security bulletins can be retrieved from:
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
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On call after hours for member emergencies only.
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