High severity · published Sep 18, 2017
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…
7.5
CVSS
95%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)95.0% · higher than 100% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HS
HTTP Server · Apache
through 2.2.34; 2.4.0; 2.4.1; 2.4.2; 2.4.3; 2.4.4; +13 more · source: NVD
DL
Debian Linux · Debian
7.0; 8.0; 9.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-9798
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-9798
Mailing List
http://openwall.com/lists/oss-security/2017/09/18/2
Third Party Advisory
http://www.debian.org/security/2017/dsa-3980
Patch
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
Patch
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
Patch
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
Patch
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
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