Inconsistent interpretation of HTTP requests in Mattermost, Mattermost Server
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2019-20866 |
| CWE-ID | CWE-444 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Mattermost Server Client/Desktop applications / Messaging software |
| Vendor | Mattermost, Inc. |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Inconsistent interpretation of HTTP requests
EUVDB-ID: #VU34232
Risk: Medium
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-2019-20866
CWE-ID:
CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Exploit availability: No
DescriptionThe vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.
An issue was discovered in Mattermost Server before 5.12.0. Use of a Proxy HTTP header, rather than the source address in an IP packet header, for obtaining IP address information was mishandled.
MitigationInstall update from vendor's website.
Vulnerable software versionsMattermost Server: 5.0.0 - 5.11.1
External linkshttp://mattermost.com/security-updates/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
