Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2017-9798

Use After Free

Published: Sep 18, 2017 | Modified: Nov 04, 2025
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N
RedHat/V2
RedHat/V3
5.9 MODERATE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2017-9798
CWEhttps://cwe.mitre.org/data/definitions/416.html

Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a users .htaccess file, or if httpd.conf has certain misconfigurations, aka Optionsbleed. This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27. The attacker sends an unauthenticated OPTIONS HTTP request when attempting to read secret data. This is a use-after-free issue and thus secret data is not always sent, and the specific data depends on many factors including configuration. Exploitation with .htaccess can be blocked with a patch to the ap_limit_section function in server/core.c.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

NameVendorStart VersionEnd Version
Http_serverApache*2.2.34 (including)
Http_serverApache2.4.0 (including)2.4.0 (including)
Http_serverApache2.4.1 (including)2.4.1 (including)
Http_serverApache2.4.2 (including)2.4.2 (including)
Http_serverApache2.4.3 (including)2.4.3 (including)
Http_serverApache2.4.4 (including)2.4.4 (including)
Http_serverApache2.4.6 (including)2.4.6 (including)
Http_serverApache2.4.7 (including)2.4.7 (including)
Http_serverApache2.4.9 (including)2.4.9 (including)
Http_serverApache2.4.10 (including)2.4.10 (including)
Http_serverApache2.4.12 (including)2.4.12 (including)
Http_serverApache2.4.16 (including)2.4.16 (including)
Http_serverApache2.4.17 (including)2.4.17 (including)
Http_serverApache2.4.18 (including)2.4.18 (including)
Http_serverApache2.4.20 (including)2.4.20 (including)
Http_serverApache2.4.23 (including)2.4.23 (including)
Http_serverApache2.4.25 (including)2.4.25 (including)
Http_serverApache2.4.26 (including)2.4.26 (including)
Http_serverApache2.4.27 (including)2.4.27 (including)
JBoss Core Services on RHEL 6RedHatjbcs-httpd24-httpd-0:2.4.23-125.jbcs.el6*
JBoss Core Services on RHEL 6RedHatjbcs-httpd24-mod_bmx-0:0.9.6-15.GA.jbcs.el6*
JBoss Core Services on RHEL 6RedHatjbcs-httpd24-mod_cluster-native-0:1.3.8-1.Final_redhat_1.jbcs.el6*
JBoss Core Services on RHEL 7RedHatjbcs-httpd24-httpd-0:2.4.23-125.jbcs.el7*
JBoss Core Services on RHEL 7RedHatjbcs-httpd24-mod_bmx-0:0.9.6-15.GA.jbcs.el7*
JBoss Core Services on RHEL 7RedHatjbcs-httpd24-mod_cluster-native-0:1.3.8-1.Final_redhat_1.jbcs.el7*
Red Hat Enterprise Linux 6RedHathttpd-0:2.2.15-60.el6_9.6*
Red Hat Enterprise Linux 6.7 Extended Update SupportRedHathttpd-0:2.2.15-47.el6_7.5*
Red Hat Enterprise Linux 7RedHathttpd-0:2.4.6-67.el7_4.5*
Red Hat Enterprise Linux 7.2 Extended Update SupportRedHathttpd-0:2.4.6-40.el7_2.6*
Red Hat Enterprise Linux 7.3 Extended Update SupportRedHathttpd-0:2.4.6-45.el7_3.5*
Red Hat JBoss Enterprise Application Platform 6.4RedHathttpd*
Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 6RedHathttpd-0:2.2.26-57.ep6.el6*
Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 6RedHatjbcs-httpd24-openssl-1:1.0.2h-14.jbcs.el6*
Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 6RedHatmod_cluster-native-0:1.2.13-9.Final_redhat_2.ep6.el6*
Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 7RedHathttpd22-0:2.2.26-58.ep6.el7*
Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 7RedHatjbcs-httpd24-openssl-1:1.0.2h-14.jbcs.el7*
Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 7RedHatmod_cluster-native-0:1.2.13-9.Final_redhat_2.ep6.el7*
Red Hat JBoss Enterprise Web Server 2 for RHEL 6RedHathttpd-0:2.2.26-57.ep6.el6*
Red Hat JBoss Enterprise Web Server 2 for RHEL 6RedHatjbcs-httpd24-openssl-1:1.0.2h-14.jbcs.el6*
Red Hat JBoss Enterprise Web Server 2 for RHEL 6RedHatmod_cluster-native-0:1.2.13-9.Final_redhat_2.ep6.el6*
Red Hat JBoss Enterprise Web Server 2 for RHEL 6RedHattomcat6-0:6.0.41-19_patch_04.ep6.el6*
Red Hat JBoss Enterprise Web Server 2 for RHEL 6RedHattomcat7-0:7.0.54-28_patch_05.ep6.el6*
Red Hat JBoss Enterprise Web Server 2 for RHEL 7RedHathttpd22-0:2.2.26-58.ep6.el7*
Red Hat JBoss Enterprise Web Server 2 for RHEL 7RedHatjbcs-httpd24-openssl-1:1.0.2h-14.jbcs.el7*
Red Hat JBoss Enterprise Web Server 2 for RHEL 7RedHatmod_cluster-native-0:1.2.13-9.Final_redhat_2.ep6.el7*
Red Hat JBoss Enterprise Web Server 2 for RHEL 7RedHattomcat6-0:6.0.41-19_patch_04.ep6.el7*
Red Hat JBoss Enterprise Web Server 2 for RHEL 7RedHattomcat7-0:7.0.54-28_patch_05.ep6.el7*
Red Hat JBoss Web Server 2.1RedHat*
Red Hat Software Collections for Red Hat Enterprise Linux 6RedHathttpd24-0:1.1-18.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 6RedHathttpd24-httpd-0:2.4.27-8.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSRedHathttpd24-0:1.1-18.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSRedHathttpd24-httpd-0:2.4.27-8.el6*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHathttpd24-0:1.1-18.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHathttpd24-curl-0:7.47.1-4.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHathttpd24-httpd-0:2.4.27-8.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHathttpd24-mod_auth_kerb-0:5.4-33.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7RedHathttpd24-nghttp2-0:1.7.1-6.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSRedHathttpd24-0:1.1-18.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSRedHathttpd24-curl-0:7.47.1-4.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSRedHathttpd24-httpd-0:2.4.27-8.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSRedHathttpd24-mod_auth_kerb-0:5.4-33.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSRedHathttpd24-nghttp2-0:1.7.1-6.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSRedHathttpd24-0:1.1-18.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSRedHathttpd24-curl-0:7.47.1-4.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSRedHathttpd24-httpd-0:2.4.27-8.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSRedHathttpd24-mod_auth_kerb-0:5.4-33.el7*
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSRedHathttpd24-nghttp2-0:1.7.1-6.el7*
Text-Only JBCSRedHathttpd*
Apache2Ubuntuartful*
Apache2Ubuntudevel*
Apache2Ubuntuesm-infra-legacy/trusty*
Apache2Ubuntuesm-infra/xenial*
Apache2Ubuntutrusty*
Apache2Ubuntutrusty/esm*
Apache2Ubuntuxenial*
Apache2Ubuntuzesty*

Potential Mitigations

References

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