CVE-2015-2780

published 2017-10-16

CVE-2015-2780: Unrestricted file upload vulnerability in Berta CMS allows remote attackers to execute arbitrary code by uploading a crafted image file with an executable…

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

Unrestricted file upload vulnerability in Berta CMS allows remote attackers to execute arbitrary code by uploading a crafted image file with an executable extension, then accessing it via a direct request to the file in an unspecified directory.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
berta	berta_cms	<= 0.8.9b	—

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

url /engine/upload.php?entry=true&mediafolder=.all↗

filename c.php↗

path /engine/upload.php↗

bytes↗

GIF89

• → The upload endpoint /engine/upload.php does not require authentication on vulnerable versions; monitor for unauthenticated POST requests to this path. ↗
• → Attackers upload files with executable extensions (e.g., .php) disguised as images by prepending a valid GIF magic bytes header (GIF89) to bypass PHP getimagesize() checks. ↗
• → Detect multipart file uploads to /engine/upload.php where the uploaded filename has a .php (or other executable) extension, regardless of Content-Type. ↗
• → The query parameter 'mediafolder=.all' is used in the exploit; alert on POST requests to upload.php containing this parameter. ↗
• → GIF polyglot PHP webshells will begin with GIF89 magic bytes; scan uploaded files in the Berta CMS media directories for files with executable extensions containing GIF magic bytes. ↗

• · The vulnerability is fixed in berta-0.8.10b.zip and later; the patch enforces authentication for all file uploads. Ensure the deployed version is 0.8.10b or newer. ↗

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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