CVE-2017-11151

published 2017-08-08

CVE-2017-11151: A vulnerability in synotheme_upload.php in Synology Photo Station before 6.7.3-3432 and 6.3-2967 allows remote attackers to upload arbitrary files without…

Priority P1 81 critical 9.8 CVSS 3.0

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

EXPLOIT

A vulnerability in synotheme_upload.php in Synology Photo Station before 6.7.3-3432 and 6.3-2967 allows remote attackers to upload arbitrary files without authentication via the logo_upload action.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
synology	photo_station	<= 6.7.2-3429	—
synology	photo_station	—	—
synology	synology_photo_station	—	—

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

path /photo/include/synotheme_upload.php↗

path /photo/include/file_upload.php↗

path /photo/admin/general_setting.php↗

path /photo/PixlrEditorHandler.php↗

path /photo/facebook/exploit.php↗

path /../../../../../var/packages/PhotoStation/etc/blog/photo_custom_preview_logo.png↗

path /../../../../../var/services/photo/@eaDir/SYNOPHOTO_THEME_DIR/photo_custom_preview_logo.png↗

path /volume1/photo/../../../volume1/@appstore/PhotoStation/photo/facebook/exploit↗

command action=logo_upload↗

• → Detect unauthenticated POST requests to synotheme_upload.php with the 'logo_upload' action parameter — this is the initial arbitrary file upload step requiring no authentication. ↗
• → Detect POST requests to /photo/include/file_upload.php with a 'session' parameter containing path traversal sequences (e.g., '/../../../../../') — this is used to load the forged session file and authenticate as a fake admin. ↗
• → Detect POST requests to /photo/PixlrEditorHandler.php with 'type=php' and a base64-encoded 'image' parameter using the data:// URI scheme — this is the step that writes a PHP webshell to the server. ↗
• → Detect GET requests to /photo/facebook/exploit.php — this path is used to execute the uploaded PHP webshell as the final RCE step. ↗
• → Monitor for processes spawned under the PhotoStation user context (uid=138862) that are not expected child processes of the Photo Station application — indicative of successful RCE. ↗
• → Detect PHP files written to /volume1/@appstore/PhotoStation/photo/facebook/ — this directory is not a normal location for PHP files and indicates webshell placement via the exploit chain. ↗

• · The session file path used in the fake authentication step varies by Synology Photo Station version — two different traversal paths are noted in the exploit. ↗

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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