Vulnerability Monitor

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CVE-2017-9798

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.

Published

2017-09-18T15:29:00.307

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: NONE
  • Availability Impact: NONE
Exploitability Score

10.0

Impact Score

2.9

Weaknesses
  • Type: Primary
    CWE-416
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application apache http_server ≤ 2.2.34 Yes
Application apache http_server 2.4.0 Yes
Application apache http_server 2.4.1 Yes
Application apache http_server 2.4.2 Yes
Application apache http_server 2.4.3 Yes
Application apache http_server 2.4.4 Yes
Application apache http_server 2.4.6 Yes
Application apache http_server 2.4.7 Yes
Application apache http_server 2.4.9 Yes
Application apache http_server 2.4.10 Yes
Application apache http_server 2.4.12 Yes
Application apache http_server 2.4.16 Yes
Application apache http_server 2.4.17 Yes
Application apache http_server 2.4.18 Yes
Application apache http_server 2.4.20 Yes
Application apache http_server 2.4.23 Yes
Application apache http_server 2.4.25 Yes
Application apache http_server 2.4.26 Yes
Application apache http_server 2.4.27 Yes
Operating System debian debian_linux 7.0 Yes
Operating System debian debian_linux 8.0 Yes
Operating System debian debian_linux 9.0 Yes
References