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AUSCERT External Security Bulletin Redistribution
ESB-2020.2735
Apache 2.4 vulnerabilities
10 August 2020
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AusCERT Security Bulletin Summary
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Product: Apache HTTP Server
Publisher: The Apache Software Foundation
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-11993 CVE-2020-11985 CVE-2020-11984
CVE-2020-9490
Original Bulletin:
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-9490
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11993
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11985
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11984
Comment: This bulletin contains four (4) security advisories.
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CVE-2020-11984: mod_uwsgi buffer overlow
Severity: moderate
Vendor: The Apache Software Foundation
Versions Affected:
httpd 2.4.32 to 2.4.44
Description:
Apache HTTP Server 2.4.32 to 2.4.44
mod_proxy_uwsgi info disclosure and possible RCE
Mitigation:
disable mod_uwsgi
Credit:
Discovered by Felix Wilhelm of Google Project Zero
References:
https://httpd.apache.org/security/vulnerabilities_24.html
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CVE-2020-11985: CWE-345: Insufficient verification of data authenticity
Severity: low
Vendor: The Apache Software Foundation
Versions Affected:
httpd 2.4.1 to 2.4.23
Description:
Apache HTTP Server 2.4.1 to 2.4.23
IP address spoofing when proxying using mod_remoteip and mod_rewrite
Mitigation:
Disable mod_remoteip
Credit:
Initially reported at https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1875299
References:
https://httpd.apache.org/security/vulnerabilities_24.html
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CVE-2020-11993: Push Diary Crash on Specifically Crafted HTTP/2 Header
Severity: moderate
Vendor: Apache Software Foundation
Versions Affected:
Apache HTTP Server 2.4.20 to 2.4.43
Description:
Apache HTTP Server versions 2.4.20 to 2.4.43
When trace/debug was enabled for the HTTP/2 module and on
certain traffic edge patterns, logging statements were made on
the wrong connection, causing concurrent use of memory pools.
Configuring the LogLevel of mod_http2 above "info" will mitigate this vulnerability for unpatched servers.
Mitigation:
Credit:
Felix Wilhelm of Google Project Zero
References:
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11993
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CVE-2020-9490: Push Diary Crash on Specifically Crafted HTTP/2 Header
Severity: important
Vendor: Apache Software Foundation
Versions Affected:
Apache HTTP Server 2.4.20 to 2.4.43
Description:
Apache HTTP Server versions 2.4.20 to 2.4.43
A specially crafted value for the 'Cache-Digest' header in a HTTP/2
request would result in a crash when the server actually tries to HTTP/2
PUSH a resource afterwards.
Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability for unpatched servers.
Mitigation:
Credit:
Felix Wilhelm of Google Project Zero
References:
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-9490
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