CVE-2017-6315

published 2017-09-19

CVE-2017-6315: Astaro Security Gateway (aka ASG) 7 allows remote attackers to execute arbitrary code via a crafted request to index.plx.

Priority P2 73 critical 9.8 CVSS 3.0

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

EXPLOIT

Astaro Security Gateway (aka ASG) 7 allows remote attackers to execute arbitrary code via a crafted request to index.plx.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
sophos	astaro_security_gateway_firmware	—	—
sophos	astaro_security_gateway_firmware	—	—

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

port 4472↗

filename payload.pl↗

command exec("/bin/sh -i")↗

• → Monitor for outbound TCP connections from the ASG appliance to attacker-controlled IPs on ports 80, 443, and 4444 — the exploit uses these for multi-stage reverse shell callbacks. ↗
• → Alert on internal TCP connections to localhost port 4472 — the exploit pivots to the privileged 'confd' daemon on this port to achieve root-level code execution. ↗
• → Detect Perl Storable deserialization abuse: look for crafted serialized objects where a package name (252 'A' chars) is replaced with a Perl eval payload — indicative of the Storable nfreeze/thaw RCE technique used in this exploit. ↗
• → Look for the Perl reverse-shell one-liner pattern using IO::Socket::INET with exec('/bin/sh -i') and STDIN/STDOUT/STDERR redirection to a socket — this is the final stage root shell payload. ↗

• · The exploit was tested specifically against ASG versions 7.500 and 7.506; other version 7.x builds may also be vulnerable but were not confirmed. ↗
• · The exploit requires the attacker to be reachable from the ASG appliance on ports 80, 443, and optionally 4444 for the multi-stage callback chain to succeed. ↗
• · The first POST uses port 81 to clear the backend cache before the actual exploitation request on port 80 — both requests to /index.plx are required for reliable exploitation. ↗

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 10.0 CRITICAL AV:N/AC:L/Au:N/C:C/I:C/A:C

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