CVE-2020-11993
published 2020-08-07CVE-2020-11993: 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…
PriorityP356high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
56.45%
99.1th percentile
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.
Affected
21 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | http_server | >= 2.4.20 < 2.4.44 | 2.4.44 |
| apache | httpd | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| debian | apache2 | < apache2 2.4.46-1 (bookworm) | apache2 2.4.46-1 (bookworm) |
| debian | debian_linux | — | — |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| msrc | cm1_httpd_2.4.46-5_on_cbl_mariner_1.0 | — | — |
| opensuse | leap | — | — |
| opensuse | leap | — | — |
| oracle | communications_element_manager | 8.2.0 – 8.2.2 | — |
| oracle | communications_session_report_manager | 8.2.0 – 8.2.2 | — |
| oracle | communications_session_route_manager | 8.2.0 – 8.2.2 | — |
| oracle | enterprise_manager_ops_center | — | — |
| oracle | hyperion_infrastructure_technology | — | — |
| oracle | instantis_enterprisetrack | — | — |
| oracle | instantis_enterprisetrack | — | — |
| oracle | instantis_enterprisetrack | — | — |
| oracle | zfs_storage_appliance_kit | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Vulnerability is triggered only when trace/debug logging is enabled for the HTTP/2 module (mod_http2); monitor for LogLevel set to 'debug' or 'trace' on servers running Apache httpd 2.4.20–2.4.43 ↗
- →Upstream patch commit for mod_h2 can be used to verify whether a build is patched or to diff for detection rule development ↗
- →Exploitation may manifest as unexpected Apache httpd crashes or denial-of-service; correlate crash/core-dump events on servers with HTTP/2 and debug/trace logging enabled ↗
- ·Setting LogLevel of mod_http2 above 'info' (e.g., 'warn' or higher) mitigates the vulnerability on unpatched servers by preventing the vulnerable trace/debug logging paths from executing ↗
- ·Only Apache httpd versions 2.4.20 through 2.4.43 are affected; version 2.4.44 (released 2020-08-07) contains the fix ↗
- ·Red Hat Enterprise Linux 5, 6, and 7 do not ship the vulnerable version of httpd and are not affected; scope detection efforts to RHEL 8 and equivalent platforms ↗
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv2.04.3MEDIUMAV:N/AC:M/Au:N/C:N/I:N/A:P
osv9.8CRITICAL
vendor_ubuntu9.8CRITICAL
vendor_apache7.5
vendor_debian7.5HIGH
vendor_msrc7.5HIGH
vendor_redhat7.5HIGH
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Ubuntu
Apache HTTP Server vulnerabilities
vendor_ubuntu·2020-08-13·CVSS 9.8
CVE-2020-9490 [CRITICAL] Apache HTTP Server vulnerabilities
Title: Apache HTTP Server vulnerabilities
Summary: Several security issues were fixed in Apache HTTP Server.
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
Microsoft
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 concur
vendor_msrc·2020-08-11·CVSS 7.5
CVE-2020-11993 [HIGH] CWE-444 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 concur
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.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing C
Red Hat
httpd: mod_http2 concurrent pool usage
vendor_redhat·2020-08-07·CVSS 7.5
CVE-2020-11993 [HIGH] CWE-400 httpd: mod_http2 concurrent pool usage
httpd: mod_http2 concurrent pool usage
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.
A flaw was found in Apache httpd in versions 2.4.20 to 2.4.43. Logging using the wrong pool by mod_http2 at debug/trace log level may lead to potential crashes and denial of service. The highest threat from this vulnerability is to system availability.
Statement: Red Hat Enterprise Linux 5, 6, and 7 do not ship the vulnerable version of httpd and, thus, are not affected.
Package: httpd (Red Hat Enterprise Linux 5) - No
Debian
CVE-2020-11993: apache2 - Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for th...
vendor_debian·2020·CVSS 7.5
CVE-2020-11993 [HIGH] CVE-2020-11993: apache2 - Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for th...
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.
Scope: local
bookworm: resolved (fixed in 2.4.46-1)
bullseye: resolved (fixed in 2.4.46-1)
forky: resolved (fixed in 2.4.46-1)
sid: resolved (fixed in 2.4.46-1)
trixie: resolved (fixed in 2.4.46-1)
Apache
Apache httpd: CVE-2020-11993
vendor_apache·CVSS 7.5
CVE-2020-11993 Apache httpd: CVE-2020-11993
Apache httpd: CVE-2020-11993
In 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. Acknowledgements: Felix Wilhelm of Google Project Zero Reported to security team 2020-06-16 Issue public 2020-08-07 Update 2.4.44 released 2020-08-07 Affects 2.4.43, 2.4.39, 2.4.38, 2.4.37, 2.4.35, 2.4.34, 2.4.33, 2.4.30, 2.4.29, 2.4.28, 2.4.27, 2.4.26, 2.4.25, 2.4.23, 2.4.20
Severity: moderate
GHSA
GHSA-89mq-r3q6-9q3q: Apache HTTP Server versions 2
ghsa_unreviewed·2022-05-24
CVE-2020-11993 [MEDIUM] CWE-444 GHSA-89mq-r3q6-9q3q: Apache HTTP Server versions 2
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.
OSV
apache2 vulnerabilities
osv·2020-08-13·CVSS 9.8
CVE-2020-1927 [CRITICAL] apache2 vulnerabilities
apache2 vulnerabilities
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
OSV
CVE-2020-11993: Apache HTTP Server versions 2
osv·2020-08-07·CVSS 7.5
CVE-2020-11993 [HIGH] CVE-2020-11993: Apache HTTP Server versions 2
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-11993 mod_http2: httpd: mod_http2 concurrent pool usage [fedora-all]
bugzilla·2020-08-11·CVSS 7.5
CVE-2020-11993 [HIGH] CVE-2020-11993 mod_http2: httpd: mod_http2 concurrent pool usage [fedora-all]
CVE-2020-11993 mod_http2: httpd: mod_http2 concurrent pool usage [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported versions
Bugzilla
CVE-2020-11993 httpd: mod_http2 concurrent pool usage
bugzilla·2020-08-05·CVSS 7.5
CVE-2020-11993 [HIGH] CVE-2020-11993 httpd: mod_http2 concurrent pool usage
CVE-2020-11993 httpd: mod_http2 concurrent pool usage
A flaw was found in httpd before version 2.4.46. Logging using the wrong pool by mod_http2 at debug/trace log level may lead to potential crashes and denial of service.
Upstream patch:
https://github.com/icing/mod_h2/commit/89773a4f98ee9a9fb402470e04b6f4044faa7fdf
Discussion:
Acknowledgments:
Name: the Apache project
---
This vulnerability is out of security support scope for the following product:
* Red Hat JBoss Enterprise Web Server 2
Please refer to https://access.redhat.com/support/policy/updates/jboss_notes for more details.
---
Created httpd tracking bugs for this issue:
Affects: fedora-all [bug 1868149]
---
External References:
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11993
---
Statemen
Qualys
Mitigating the Risk of Zero-Day Vulnerabilities by using Compensating Controls
blogs_qualys·2022-08-23
Mitigating the Risk of Zero-Day Vulnerabilities by using Compensating Controls
## Table of Contents
Why Are Zero-Day Attacks/Exploits so Dangerous?
How Qualys Policy Compliance Helps Combat Zero-Day Threats
Benefit of Qualys Policy Compliance for Zero-Day Threats
Summary
Getting Started
Contributors
Zero-day vulnerability attacks have emerged as a major cybersecurity threat in the last few years. Organizations most often targeted include large enterprises and government/Federal agencies. However, any organization, regardless of its size, business, or industry, is a potential target for zero-day threats.
Most notably, already publicly disclosed. This means that one out of every four zero-day exploits detected could potentially have been avoided if a more thorough investigation and patching effort had been pursued. In 2021, around 58 zero-day vulnerabilities we
Tenable
Oracle January 2021 Critical Patch Update Includes Fixes for Five Critical WebLogic Flaws (CVE-2021-2109)
blogs_tenable·2021-01-20·CVSS 7.2
[HIGH] Oracle January 2021 Critical Patch Update Includes Fixes for Five Critical WebLogic Flaws (CVE-2021-2109)
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AWS security
Azure security
Cloud Security Posture Man
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00068.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00071.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-10/msg00081.htmlhttp://packetstormsecurity.com/files/160393/Apache-2-HTTP2-Module-Concurrent-Pool-Usage.htmlhttps://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11993https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r09bb998baee74a2c316446bd1a41ae7f8d7049d09d9ff991471e8775%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r2c6083f6a2027914a0f5b54e2a1f4fa98c03f8693b58460911818255%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r5debe8f82728a00a4a68bc904dd6c35423bdfc8d601cfb4579f38bf1%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r623de9b2b2433a87f3f3a15900419fc9c00c77b26936dfea4060f672%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r9e9f1a7609760f0f80562eaaec2aa3c32d525c3e0fca98b475240c71%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rdf3e5d0a5f5c3d90d6013bccc6c4d5af59cf1f8c8dea5d9a283d13ce%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rf71eb428714374a6f9ad68952e23611ec7807b029fd6a1b4f5f732d9%40%3Ccvs.httpd.apache.org%3Ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NKWG2EXAQQB6LMLATKZ7KLSRGCSHVAN/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVFDBVM6E3JF3O7RYLRPRCH3RDRHJJY/https://security.gentoo.org/glsa/202008-04https://security.netapp.com/advisory/ntap-20200814-0005/https://usn.ubuntu.com/4458-1/https://www.debian.org/security/2020/dsa-4757https://www.oracle.com/security-alerts/cpujan2021.htmlhttps://www.oracle.com/security-alerts/cpuoct2020.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00068.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-08/msg00071.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-10/msg00081.htmlhttp://packetstormsecurity.com/files/160393/Apache-2-HTTP2-Module-Concurrent-Pool-Usage.htmlhttps://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-11993https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r09bb998baee74a2c316446bd1a41ae7f8d7049d09d9ff991471e8775%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r2c6083f6a2027914a0f5b54e2a1f4fa98c03f8693b58460911818255%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r5debe8f82728a00a4a68bc904dd6c35423bdfc8d601cfb4579f38bf1%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r623de9b2b2433a87f3f3a15900419fc9c00c77b26936dfea4060f672%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r9e9f1a7609760f0f80562eaaec2aa3c32d525c3e0fca98b475240c71%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rdf3e5d0a5f5c3d90d6013bccc6c4d5af59cf1f8c8dea5d9a283d13ce%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rf71eb428714374a6f9ad68952e23611ec7807b029fd6a1b4f5f732d9%40%3Ccvs.httpd.apache.org%3Ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NKWG2EXAQQB6LMLATKZ7KLSRGCSHVAN/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVFDBVM6E3JF3O7RYLRPRCH3RDRHJJY/https://security.gentoo.org/glsa/202008-04https://security.netapp.com/advisory/ntap-20200814-0005/https://usn.ubuntu.com/4458-1/https://www.debian.org/security/2020/dsa-4757https://www.oracle.com/security-alerts/cpujan2021.htmlhttps://www.oracle.com/security-alerts/cpuoct2020.html
2020-08-07
Published