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CVE-2017-9798

Publication date 18 September 2017

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
apache2 17.10 artful
Fixed 2.4.27-2ubuntu3
17.04 zesty
Fixed 2.4.25-3ubuntu2.3
16.04 LTS xenial
Fixed 2.4.18-2ubuntu3.5
14.04 LTS trusty
Fixed 2.4.7-1ubuntu4.18

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
apache2

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-3425-2
    • Apache HTTP Server vulnerability
    • 24 October 2017
    • USN-3425-1
    • Apache HTTP Server vulnerability
    • 19 September 2017

Other references