Missing signature validation in SOGo

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU59094

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-33054

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to missing validation of digital signatures for SAML messages. A remote attacker can impersonate users application users when SAML is the authentication method.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SOGo: 2.0.0 - 5.1.0

External links

http://github.com/inverse-inc/sogo/blob/master/CHANGELOG.md
http://www.sogo.nu/news.html
http://blogs.akamai.com/2021/06/sogo-and-packetfence-impacted-by-saml-implementation-vulnerabilities.html
http://lists.debian.org/debian-lts-announce/2021/07/msg00007.html
http://www.debian.org/security/2021/dsa-5029

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.