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AUSCERT External Security Bulletin Redistribution
ESB-2020.2806
USN-4458-1: Apache HTTP Server vulnerabilities
14 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Apache HTTP Server
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-11993 CVE-2020-11984 CVE-2020-9490
CVE-2020-1934 CVE-2020-1927
Reference: ESB-2020.2735
ESB-2020.1382
ESB-2020.1360
Original Bulletin:
https://usn.ubuntu.com/4458-1/
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TUSN-4458-1: Apache HTTP Server vulnerabilities
13 August 2020
Several security issues were fixed in Apache HTTP Server.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o apache2 - Apache HTTP server
Details
Fabrice Perez discovered that the Apache mod_rewrite module incorrectly
handled certain redirects. A remote attacker could possibly use this issue
to perform redirects to an unexpected URL. (CVE-2020-1927)
Chamal De Silva discovered that the Apache mod_proxy_ftp module incorrectly
handled memory when proxying to a malicious FTP server. A remote attacker
could possibly use this issue to obtain sensitive information.
(CVE-2020-1934)
Felix Wilhelm discovered that the HTTP/2 implementation in Apache did not
properly handle certain Cache-Digest headers. A remote attacker could
possibly use this issue to cause Apache to crash, resulting in a denial of
service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
(CVE-2020-9490)
Felix Wilhelm discovered that the Apache mod_proxy_uwsgi module incorrectly
handled large headers. A remote attacker could use this issue to obtain
sensitive information or possibly execute arbitrary code. This issue only
affected Ubuntu 20.04 LTS. (CVE-2020-11984)
Felix Wilhelm discovered that the HTTP/2 implementation in Apache did not
properly handle certain logging statements. A remote attacker could
possibly use this issue to cause Apache to crash, resulting in a denial of
service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
(CVE-2020-11993)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o apache2 - 2.4.41-4ubuntu3.1
o apache2-bin - 2.4.41-4ubuntu3.1
o libapache2-mod-proxy-uwsgi - 2.4.41-4ubuntu3.1
Ubuntu 18.04
o apache2 - 2.4.29-1ubuntu4.14
o apache2-bin - 2.4.29-1ubuntu4.14
Ubuntu 16.04
o apache2 - 2.4.18-2ubuntu3.17
o apache2-bin - 2.4.18-2ubuntu3.17
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-9490
o CVE-2020-11993
o CVE-2020-11984
o CVE-2020-1927
o CVE-2020-1934
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