CVE-2017-9798
Publication date 18 September 2017
Last updated 24 July 2024
Ubuntu priority
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 | ||
| 16.04 LTS xenial |
Fixed 2.4.18-2ubuntu3.5
|
|
| 14.04 LTS trusty |
Fixed 2.4.7-1ubuntu4.18
|
Patch details
| 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