CVE-2017-9798
apache2 - security update
Description
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.
How to fix CVE-2017-9798
To remediate CVE-2017-9798, upgrade the affected package to a fixed version below.
- —upgrade to 2.4.27-r1 or later
- —upgrade to 2.4.27-6 or later
- —upgrade to 2.2.22-13+deb7u12 or later
- —upgrade to 2.4.10-10+deb8u11 or later
Is CVE-2017-9798 being exploited?
Likely — EPSS is 93.8%, placing CVE-2017-9798 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (4)
- from 0, < 2.4.27-r1
- from 0, < 2.4.27-6
- from 0, < 2.2.22-13+deb7u12
- from 0, < 2.4.10-10+deb8u11
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |