Buffer Over-read in EmbedThis GoAhead

1) Buffer Over-read

EUVDB-ID: #VU23341

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-19240

CWE-ID: CWE-126 - Buffer over-read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists in the "websRedirect" function due to a boundary condition in processing redirected HTTP requests when supplied with a very large Host header. This can cause a copy of the Host header to fail, leaving that buffer uninitialized. A remote attacker can trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

GoAhead: 4.0.0 - 5.0.0

External links

http://github.com/embedthis/goahead/issues/289
http://github.com/embedthis/goahead/issues/290
http://github.com/embedthis/goahead/releases/tag/v5.0.1

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.