NULL pointer dereference in EmbedThis GoAhead

1) NULL pointer dereference

EUVDB-ID: #VU19147

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-2018-15505

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to  HTTP POST request with a specially crafted "Host" header field may cause a NULL pointer dereference error, as demonstrated by the lack of a trailing ']' character in an IPv6 address. A remote attacker can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

GoAhead: 2.1.5 - 4.0.0

Appweb: 4.0.0 - 7.0.1

External links

http://github.com/embedthis/appweb/commit/16e6979c82297d5fc4f8661e7ada975f51e4dfa9
http://github.com/embedthis/appweb/issues/605
http://github.com/embedthis/goahead/issues/264

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.