CVE-2017-6182

published 2017-03-30

CVE-2017-6182: In Sophos Web Appliance (SWA) before 4.3.1.2, a section of the machine's interface responsible for generating reports was vulnerable to remote command…

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

In Sophos Web Appliance (SWA) before 4.3.1.2, a section of the machine's interface responsible for generating reports was vulnerable to remote command injection via functions, aka NSWA-1304.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
sophos	web_appliance	<= 4.3.1.1	—

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

url /index.php?c=login↗

path /tmp/n↗

path /tmp/m↗

command echo -e <encoded_payload>>/tmp/n;chmod +rx /tmp/n;/tmp/n↗

command (echo -e <encoded_elf>>/tmp/m;chmod +rx /tmp/m;/tmp/m)↗

• → Detect POST requests to /index.php?c=report&name=traf_users containing a 'filters' JSON body where the 'trafficType' field includes shell metacharacters (pipe '|' or '&') indicating command injection attempt. ↗
• → Alert on POST requests to /index.php with parameter 'c=report' and 'pdf=1' combined with a 'filters' parameter containing pipe or ampersand characters in the 'trafficType' JSON field. ↗
• → Monitor for creation or execution of ELF binaries dropped to /tmp/m or /tmp/n on Sophos Web Appliance hosts, as the exploit stages payloads to these paths. ↗
• → The exploit is post-authentication; monitor for successful logins to /index.php?c=login followed immediately by report generation requests with anomalous 'trafficType' values as a chained attack sequence. ↗
• → The STYLE parameter (a 32-character hex string) is used as a session token across both the login and exploit requests; correlate requests sharing the same STYLE value across /index.php?c=login and /index.php?c=report endpoints. ↗

• · The exploit is post-authentication, requiring valid credentials (default username 'admin') before the command injection can be triggered. ↗
• · The vulnerability affects Sophos Web Appliance versions before 4.3.1.2; version 4.3.0.2 was specifically tested and confirmed vulnerable. ↗
• · The injection point is specifically the 'trafficType' field within the JSON 'filters' POST parameter on the reporting endpoint (c=report, name=traf_users). ↗

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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