Risk | Low |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2017-9798 |
CWE-ID | CWE-416 |
Exploitation vector | Network |
Public exploit | Public exploit code for vulnerability #1 is available. |
Vulnerable software |
Apache HTTP Server Server applications / Web servers |
Vendor | Apache Foundation |
Security Bulletin
This security bulletin contains one low risk vulnerability.
EUVDB-ID: #VU8504
Risk: Low
CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Clear]
CVE-ID: CVE-2017-9798
CWE-ID:
CWE-416 - Use After Free
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists due to use-after-free error when processing HTTP OPTIONS requests in server/core.c, when limits are configured in .htaccess or httpd.conf configuration files. A remote unauthenticated attacker can read portions of memory through HTTP OPTIONS requests and gain access to potentially sensitive data.
The vulnerability is dubbed Optionsbleed.
MitigationUpdate to version 2.4.28.
http://www.apache.org/dist/httpd/CHANGES_2.4.28
Apache HTTP Server: 2.2.0 - 2.4.27
CPE2.3https://svn.apache.org/viewvc?view=revision&revision=1807655
https://github.com/hannob/optionsbleed
https://openwall.com/lists/oss-security/2017/09/18/2
https://blog.fuzzing-project.org/60-Optionsbleed-HTTP-OPTIONS-method-can-leak-Apaches-server-memory....
https://www.apache.org/dist/httpd/CHANGES_2.4.28
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.