CVE-2017-11152

published 2017-08-08

CVE-2017-11152: Directory traversal vulnerability in PixlrEditorHandler.php in Synology Photo Station before 6.7.3-3432 and 6.3-2967 allows remote attackers to write arbitrary…

Priority P2 61 high 7.5 CVSS 3.0

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

EXPLOIT

Directory traversal vulnerability in PixlrEditorHandler.php in Synology Photo Station before 6.7.3-3432 and 6.3-2967 allows remote attackers to write arbitrary files via the path parameter.

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/PixlrEditorHandler.php↗

path /photo/admin/general_setting.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↗

• → Detect directory traversal in the 'path' parameter of POST requests to /photo/PixlrEditorHandler.php — the exploit base64-encodes a path containing '../../../' sequences to write a PHP webshell outside the photo directory. ↗
• → Detect fake session fixation: POST to /photo/include/file_upload.php with a 'session' parameter containing path traversal sequences (e.g. '/../../../../../') pointing to a previously uploaded file used as a session token. ↗
• → Detect upload of a crafted PHP serialized session payload disguised as a .jpg file to /photo/include/synotheme_upload.php with action=logo_upload — the file content is a PHP serialized string granting admin_syno_user privileges. ↗
• → Alert on GET requests to /photo/facebook/*.php — this path is used to execute the dropped webshell after the traversal write. ↗
• → The exploit chain results in code execution as uid=138862(PhotoStation); process activity under this UID following web requests to Photo Station endpoints should be treated as a compromise indicator. ↗
• → POST to /photo/PixlrEditorHandler.php with parameters action=save, type=php, and a base64-encoded 'image' field containing a data:// URI is the direct webshell-write step of the exploit. ↗

• · The session traversal path used in step 2 varies by Synology Photo Station version; two alternate paths are provided in the exploit and both should be monitored. ↗
• · This CVE (directory traversal via 'path' parameter in PixlrEditorHandler.php) is only one of four chained vulnerabilities required for full RCE; detection must cover all four stages (arbitrary file upload, fake auth, identity impersonation, and authenticated code execution). ↗

CVSS provenance

nvd v3.0 7.5 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd v2.0 5.0 MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:N

CVEs like this are exactly what “Exploited This Week” covers.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-22