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CVE-2018-7702: Securenvoy Securmail: Authentication bypass

CVE-2018-7702 is rated critical with a CVSS v3.0 base score of 9.1 and affects Securenvoy Securmail. Per its scoring, it can be exploited over the network, without authentication, without any user interaction.

Vulnerability description

SecurEnvoy SecurMail before 9.2.501 allows remote attackers to spoof transmission of arbitrary e-mail messages, resend e-mail messages to arbitrary recipients, or modify arbitrary message bodies and attachments by leveraging missing authentication and authorization.

Severity breakdown

CVSS v3.0 9.1: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

• Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
• Attack complexity: Low. No special conditions; the attack can be repeated reliably.
• Privileges required: None. No account or prior access is needed.
• User interaction: None. No action from any user is needed.
• Scope: Unchanged. Impact stays within the vulnerable component.
• Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
• Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
• Availability impact: None. No effect on availability.

Underlying weakness

CWE-862: Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Affected products

• Securenvoy Securmail: before 9.2.501

References

• http://seclists.org/fulldisclosure/2018/Mar/29
• https://www.exploit-db.com/exploits/44285/
• https://www.sec-consult.com/en/blog/advisories/multiple-critical-vulnerabilities-in-securenvoy-securmail/index.html