Attacker Value
Very Low
(1 user assessed)
Exploitability
Very High
(1 user assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
1

CVE-2020-9490

Disclosure Date: August 07, 2020 •
CVE-2020-9490 CVSS v3 Base Score: 7.5
Exploited in the Wild
Reported by ahmedredhat
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Add MITRE ATT&CK tactics and techniques that apply to this CVE.

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.

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1
Ratings
  • Attacker Value
    Very Low
  • Exploitability
    Very High
Common in enterpriseEasy to weaponizeUnauthenticatedNo useful accessVulnerable in uncommon configuration
Technical Analysis

There is a PoC in the Project Zero issue. While this is just a crash, the researcher didn’t rule out code execution.

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CVSS V3 Severity and Metrics
Base Score:
7.5 High
Impact Score:
3.6
Exploitability Score:
3.9
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Apache HTTP Server 2.4.20 to 2.4.43
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • apache,
  • canonical,
  • debian,
  • fedoraproject,
  • opensuse,
  • oracle,
  • redhat

Products

  • communications element manager,
  • communications session report manager,
  • communications session route manager,
  • debian linux 10.0,
  • enterprise linux 8.0,
  • enterprise linux eus 8.1,
  • enterprise linux eus 8.2,
  • enterprise linux eus 8.4,
  • enterprise linux eus 8.6,
  • enterprise linux for ibm z systems 8.0,
  • enterprise linux for ibm z systems eus 8.1,
  • enterprise linux for ibm z systems eus 8.2,
  • enterprise linux for ibm z systems eus 8.4,
  • enterprise linux for ibm z systems eus 8.6,
  • enterprise linux for power little endian 8.0,
  • enterprise linux for power little endian eus 8.1,
  • enterprise linux for power little endian eus 8.2,
  • enterprise linux for power little endian eus 8.4,
  • enterprise linux for power little endian eus 8.6,
  • enterprise linux server aus 8.2,
  • enterprise linux server aus 8.4,
  • enterprise linux server aus 8.6,
  • enterprise linux server for power little endian update services for sap solutions 8.1,
  • enterprise linux server for power little endian update services for sap solutions 8.2,
  • enterprise linux server for power little endian update services for sap solutions 8.4,
  • enterprise linux server for power little endian update services for sap solutions 8.6,
  • enterprise linux server tus 8.2,
  • enterprise linux server tus 8.4,
  • enterprise linux server tus 8.6,
  • enterprise linux server update services for sap solutions 8.1,
  • enterprise linux server update services for sap solutions 8.2,
  • enterprise linux server update services for sap solutions 8.4,
  • enterprise linux server update services for sap solutions 8.6,
  • enterprise manager ops center 12.4.0.0,
  • fedora 31,
  • fedora 32,
  • http server,
  • hyperion infrastructure technology 11.1.2.4,
  • instantis enterprisetrack 17.1,
  • instantis enterprisetrack 17.2,
  • instantis enterprisetrack 17.3,
  • leap 15.1,
  • leap 15.2,
  • openstack 16.1,
  • openstack for ibm power 16.1,
  • software collections 1.0,
  • ubuntu linux 16.04,
  • ubuntu linux 18.04,
  • ubuntu linux 20.04,
  • zfs storage appliance kit 8.8

Exploited in the Wild

Reported by:

References

Canonical
CVE-2020-9490 (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9490)
Advisory
GLSA-202008-04 (https://security.gentoo.org/glsa/202008-04)
[httpd-dev] 20200808 Security announcements for CVE-2020-9490/CVE-2020-11993 ? (https://lists.apache.org/thread.html/r9e9f1a7609760f0f80562eaaec2aa3c32d525c3e0fca98b475240c71@%3Cdev.httpd.apache.org%3E)
[httpd-dev] 20200811 Which version fixed the CVE-2020-9490, CVE-2020-11984 and CVE-2020-11993 vulnerabilities? (https://lists.apache.org/thread.html/r5debe8f82728a00a4a68bc904dd6c35423bdfc8d601cfb4579f38bf1@%3Cdev.httpd.apache.org%3E)
[httpd-dev] 20200811 Re: Which version fixed the CVE-2020-9490, CVE-2020-11984 and CVE-2020-11993 vulnerabilities? (https://lists.apache.org/thread.html/r623de9b2b2433a87f3f3a15900419fc9c00c77b26936dfea4060f672@%3Cdev.httpd.apache.org%3E)
https://security.netapp.com/advisory/ntap-20200814-0005
USN-4458-1 (https://usn.ubuntu.com/4458-1)
FEDORA-2020-8122a8daa2 (https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4NKWG2EXAQQB6LMLATKZ7KLSRGCSHVAN)
FEDORA-2020-b58dc5df38 (https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ITVFDBVM6E3JF3O7RYLRPRCH3RDRHJJY)
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00068.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00071.html
DSA-4757 (https://www.debian.org/security/2020/dsa-4757)
https://security.netapp.com/advisory/ntap-20200814-0005/
USN-4458-1 (https://usn.ubuntu.com/4458-1/)
FEDORA-2020-8122a8daa2 (https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4NKWG2EXAQQB6LMLATKZ7KLSRGCSHVAN/)
FEDORA-2020-b58dc5df38 (https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ITVFDBVM6E3JF3O7RYLRPRCH3RDRHJJY/)
openSUSE-SU-2020:1792 (http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00081.html)
[httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210330 svn commit: r1073143 [3/3] - in /websites/staging/httpd/trunk/content: ./ security/ (https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210330 svn commit: r1888194 [13/13] - /httpd/site/trunk/content/security/json/ (https://lists.apache.org/thread.html/r09bb998baee74a2c316446bd1a41ae7f8d7049d09d9ff991471e8775@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210330 svn commit: r1073140 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210330 svn commit: r1073139 [13/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (https://lists.apache.org/thread.html/rdf3e5d0a5f5c3d90d6013bccc6c4d5af59cf1f8c8dea5d9a283d13ce@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210330 svn commit: r1888203 - /httpd/site/trunk/content/security/json/CVE-2020-9490.json (https://lists.apache.org/thread.html/r97d0faab6ed8fd0d439234b16d05d77b22a07b0c4817e7b3cca419cc@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210330 svn commit: r1073148 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-9490.json (https://lists.apache.org/thread.html/ra4da876037477c06f2677d7a1e10b5a8613000fca99c813958070fe9@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210330 svn commit: r1073149 [13/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (https://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210407 svn commit: r1073454 - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-9490.json security/vulnerabilities_24.html (https://lists.apache.org/thread.html/r9e485ce5a01c9dc3d4d785a7d28aa7400ead1e81884034ff1f03cfee@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210407 svn commit: r1888469 - /httpd/site/trunk/content/security/json/CVE-2020-9490.json (https://lists.apache.org/thread.html/r0b6541c5fb2f8fb383861333400add7def625bc993300300de0b4f8d@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210603 svn commit: r1075355 - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (https://lists.apache.org/thread.html/rfed9fea918e090383da33e393eb6c2755fccf05032bd7d6eb4737c9e@%3Ccvs.httpd.apache.org%3E)
[httpd-cvs] 20210606 svn commit: r1075470 [4/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d@%3Ccvs.httpd.apache.org%3E)
Miscellaneous
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-9490
https://www.oracle.com/security-alerts/cpuoct2020.html
http://packetstormsecurity.com/files/160392/Apache-2.4.43-mod_http2-Memory-Corruption.html
https://www.oracle.com/security-alerts/cpujan2021.html

Additional Info

Authenticated
Unknown
Exploitable
Unknown
Reliability
Unknown
Stability
Unknown
Available Mitigations
Unknown
Shelf Life
Unknown
Userbase/Installbase
Unknown
Patch Effectiveness
Unknown
Technical Analysis