Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Http Server | <= 2.2.34 |
| Debian | Debian Linux | 7.0 |
Related Weaknesses (CWE)
References
- http://openwall.com/lists/oss-security/2017/09/18/2Mailing ListVDB Entry
- http://www.debian.org/security/2017/dsa-3980Third Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.htmlPatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlPatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.htmlPatchThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.htmlPatchThird Party Advisory
- http://www.securityfocus.com/bid/100872Third Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/105598Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039387Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:2882Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:2972Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3018Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3113Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3114Third Party Advisory
- https://access.redhat.com/errata/RHSA-2017:3193Third Party Advisory
FAQ
What is CVE-2017-9798?
CVE-2017-9798 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 Optionsbl...
How severe is CVE-2017-9798?
CVE-2017-9798 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-9798?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Http Server, Debian Debian Linux.