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 2017-09-18 15:29:00
Updated 2021-06-06 11:15:21
View at NVD,   CVE.org
Vulnerability category: Memory Corruption

Threat overview for CVE-2017-9798

Top countries where our scanners detected CVE-2017-9798
Top open port discovered on systems with this issue 80
IPs affected by CVE-2017-9798 4,950,327
Threat actors abusing to this issue? Yes
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Exploit prediction scoring system (EPSS) score for CVE-2017-9798

97.39%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 100 %
Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2017-9798

  • Apache Optionsbleed Scanner
    Disclosure Date: 2017-09-18
    First seen: 2020-04-26
    auxiliary/scanner/http/apache_optionsbleed
    This module scans for the Apache optionsbleed vulnerability where the Allow response header returned from an OPTIONS request may bleed memory if the server has a .htaccess file with an invalid Limit method defined.

CVSS scores for CVE-2017-9798

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.0
MEDIUM AV:N/AC:L/Au:N/C:P/I:N/A:N
10.0
2.9
NIST
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.9
3.6
NIST

CWE ids for CVE-2017-9798

  • The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2017-9798

Products affected by CVE-2017-9798

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