Multiple vulnerabilities in Apache HTTP Server
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 6 |
| CVE-ID | CVE-2019-0197 CVE-2019-0196 CVE-2019-0211 CVE-2019-0217 CVE-2019-0215 CVE-2019-0220 |
| CWE-ID | CWE-399 CWE-416 CWE-264 CWE-362 CWE-20 |
| Exploitation vector | Network |
| Public exploit | Vulnerability #3 is being exploited in the wild. |
| Vulnerable software Subscribe |
Apache HTTP Server Server applications / Web servers |
| Vendor | Apache Foundation |
Security Bulletin
This security bulletin contains information about 6 vulnerabilities.
1) Resource management error
EUVDB-ID: #VU18108
Risk: Medium
CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2019-0197
CWE-ID:
CWE-399 - Resource Management Errors
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an error within the mod_http2 module when processing update requests from http/1.1 to http/2, if this was not the first request on a connection. A remote attacker can send specially crafted requests to the affected server and perform denial of service attack.
Successful exploitation of the vulnerability requires that HTTP/2 protocol is enabled for a "http:" host or H2Upgrade is enabled for h2 on a "https:" host.
Install updates from vendor's website.
Vulnerable software versionsApache HTTP Server: 2.4.34 - 2.4.38
External linkshttp://www.apache.org/dist/httpd/CHANGES_2.4
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
EUVDB-ID: #VU18109
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-2019-0196
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform denial of service attack.
The vulnerability exists due to a use-after-free error within the mod_http2 module when processing HTTP/2 requests. A remote attacker can make the application to access freed memory during string comparison when determining the method of a request and process the request incorrectly.
Successful exploitation of the vulnerability may allow an attacker to gain access to sensitive information or perform a denial of service attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsApache HTTP Server: 2.4.17 - 2.4.38
External linkshttp://www.apache.org/dist/httpd/CHANGES_2.4
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.
3) Privilege escalation
EUVDB-ID: #VU18110
Risk: Low
CVSSv3.1: 5.1 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:H/RL:O/RC:C]
CVE-ID: CVE-2019-0211
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists within MPM implementation due to the application does not properly maintain each child's listener bucket number in the scoreboard that may lead to unprivileged code or scripts run by server (e.g. via mod_php) to modify the scoreboard and abuse the privileged main process.
A local user can execute arbitrary code on the system with privileges of the Apache HTTP Server code process.
Install updates from vendor's website.
Vulnerable software versionsApache HTTP Server: 2.4.0 - 2.4.38
External linkshttp://www.apache.org/dist/httpd/CHANGES_2.4
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
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.
The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.
4) Race condition
EUVDB-ID: #VU18111
Risk: Low
CVSSv3.1: 5.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2019-0217
Exploit availability: No
DescriptionInstall updates from vendor's website.
Vulnerable software versionsApache HTTP Server: 2.4.0 - 2.4.38
External linkshttp://www.apache.org/dist/httpd/CHANGES_2.4
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user 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.
5) Permissions, Privileges, and Access Controls
EUVDB-ID: #VU18112
Risk: Medium
CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2019-0215
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists within the mod_ssl module when processing access controls for per-location/per-dir client certificate verification in TLSv1.3. A remote authenticated attacker can gain access to restricted directories on the server.
MitigationInstall updates from vendor's website.
Vulnerable software versionsApache HTTP Server: 2.4.36 - 2.4.38
External linkshttp://www.apache.org/dist/httpd/CHANGES_2.4
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user 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.
6) Input validation error
EUVDB-ID: #VU18113
Risk: Low
CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2019-0220
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass certain security restrictions.
The vulnerability exists due to the web server does not merge consecutive slashes in URLs, that can lead to incorrect processing of requests when accessing CGI programs. Such web server behavior may lead to security restrictions bypass.
Install updates from vendor's website and make sure that "MergeSlashes" option in the configuration is not set to "Off".
Apache HTTP Server: 2.2.0 - 2.4.38
External linkshttp://www.apache.org/dist/httpd/CHANGES_2.4
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.
