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CVE-2017-9798

Status Candidate

Overview

Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a user's .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.

Related Files

Red Hat Security Advisory 2017-2972-01
Posted Oct 19, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-2972-01 - The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server. Security Fix: A use-after-free flaw was found in the way httpd handled invalid and previously unregistered HTTP methods specified in the Limit directive used in an .htaccess file. A remote attacker could possibly use this flaw to disclose portions of the server memory, or cause httpd child process to crash.

tags | advisory, remote, web
systems | linux, redhat
advisories | CVE-2017-12171, CVE-2017-9798
MD5 | e64652074e2e5759339d4e7268697da3
Red Hat Security Advisory 2017-2882-01
Posted Oct 12, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-2882-01 - The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server. Security Fix: A use-after-free flaw was found in the way httpd handled invalid and previously unregistered HTTP methods specified in the Limit directive used in an .htaccess file. A remote attacker could possibly use this flaw to disclose portions of the server memory, or cause httpd child process to crash.

tags | advisory, remote, web
systems | linux, redhat
advisories | CVE-2017-9798
MD5 | ad9389de508874fed2fa6236f05eaf2a
Ubuntu Security Notice USN-3425-1
Posted Sep 20, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3425-1 - Hanno Boeck discovered that the Apache HTTP Server incorrectly handled Limit directives in .htaccess files. In certain configurations, a remote attacker could possibly use this issue to read arbitrary server memory, including sensitive information. This issue is known as Optionsbleed.

tags | advisory, remote, web, arbitrary
systems | linux, ubuntu
advisories | CVE-2017-9798
MD5 | bfa83093442c8cb0223e5a49b009a8b1
Slackware Security Advisory - httpd Updates
Posted Sep 19, 2017
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New httpd packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix a security issue.

tags | advisory
systems | linux, slackware
advisories | CVE-2017-9798
MD5 | 886e6431276c1f7f5f360f4268f47575
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