Two vulnerabilities in Apache HTTP Server
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2017-9788 CVE-2017-9789 |
| CWE-ID | CWE-200 CWE-416 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Apache HTTP Server Server applications / Web servers |
| Vendor | Apache Foundation |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Information disclosure
EUVDB-ID: #VU7517
Risk: Low
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-9788
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a remote unauthenticated attacker to obtain potentially sensitive information on the targeted system.
The weakness exists due to improper initialization of the value placeholder in [Proxy-]Authorization headers of type 'Digest' before or between successive key=value assignments by mod_auth_digest. A remote attacker can provide an initial key with no '=' assignment to cause the stale value of uninitialized pool memory used by the prior request to leak.
Successful exploitation of the vulnerability results in information disclosure.
MitigationUpdate to version 2.4.27.
Vulnerable software versionsApache HTTP Server: 2.4.1 - 2.4.26
External linkshttp://httpd.apache.org/security/vulnerabilities_24.html
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.
2) Use-after-free error
EUVDB-ID: #VU7518
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2017-9789
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote unauthenticated attacker to cause DoS condition on the targeted system.
The weakness exists due to use-after-free condition in the mod_http2 function. A remote attacker can trigger memory corruption and cause the server to crash.
Successful exploitation of the vulnerability results in denial of service.
MitigationUpdate to version 2.4.27.
Apache HTTP Server: 2.4.26
External linkshttp://httpd.apache.org/security/vulnerabilities_24.html
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.
