Remote denial of service in Apache HTTP server



Published: 2018-07-18
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2018-8011
CVE-2018-1333
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Apache HTTP Server
Server applications / Web servers

Vendor Apache Foundation

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU13907

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-2018-8011

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to improper filtering of input data within "mod_md" apache module when processing requests. A remote attacker can send a specially crafted HTTP request to the affected web server and trigger denial of service condition via coredumps.


Mitigation

Update to version 2.4.34.

Vulnerable software versions

Apache HTTP Server: 2.4.0 - 2.4.33


CPE2.3 External links

http://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) Improper input validation

EUVDB-ID: #VU13908

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-2018-1333

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to insufficient filtering of incoming data within "mod_http2" apache module. A remote attacker can send a specially crafted HTTP request to the affected web server and trigger daemon crash.

Mitigation

Update to version 2.4.34.

Vulnerable software versions

Apache HTTP Server: 2.4.0 - 2.4.33


CPE2.3 External links

http://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.



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