CVE-2017-6416

published 2017-03-06

CVE-2017-6416: An issue was discovered in SysGauge 1.5.18. A buffer overflow vulnerability in SMTP connection verification leads to arbitrary code execution. The attack…

Priority P2 63 critical 9.8 CVSS 3.0

AV N AC L PR N UI N S U C H I H A H

EXPLOIT

An issue was discovered in SysGauge 1.5.18. A buffer overflow vulnerability in SMTP connection verification leads to arbitrary code execution. The attack vector is a crafted SMTP daemon that sends a long 220 (aka "Service ready") string.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
flexense	sysgauge	—	—

Detection & IOCs extracted from sources · hover to see the quote

version SysGauge 1.5.18↗

other SMTP 220 Service Ready oversized response string↗

• → Monitor for SysGauge client connections to rogue/unexpected SMTP servers; a malicious SMTP server sends an abnormally long 220 'Service ready' banner to trigger the buffer overflow. ↗
• → A Metasploit module exists for this vulnerability (windows/smtp/sysgauge_client_bof); presence of this module in use or related artifacts on a host should be treated as a high-confidence indicator of exploitation attempt. ↗

• · Exploitation requires the victim SysGauge 1.5.18 client to initiate an SMTP server validation connection toward an attacker-controlled SMTP server; the attacker must be positioned to respond with a crafted 220 banner. ↗
• · Successful exploitation yields only an unprivileged shell; further privilege escalation steps would be required for full system compromise. ↗

CVSS provenance

nvd v3.0 9.8 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 7.5 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P

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