CVE-2021-39433

published 2021-10-04

CVE-2021-39433: A local file inclusion (LFI) vulnerability exists in version BIQS IT Biqs-drive v1.83 and below when sending a specific payload as the file parameter to…

Priority P3 56 high 7.5 CVSS 3.1

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

EXPLOIT

A local file inclusion (LFI) vulnerability exists in version BIQS IT Biqs-drive v1.83 and below when sending a specific payload as the file parameter to download/index.php. This allows the attacker to read arbitrary files from the server with the permissions of the configured web-user.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
biqs	biqsdrive	<= 1.83	—

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

url /download/index.php?file=../../../../../../../../../etc/passwd↗

path /download/index.php↗

• → Look for GET requests to /download/index.php with a 'file' parameter containing path traversal sequences (e.g., '../') targeting sensitive files such as /etc/passwd. ↗
• → A successful LFI exploitation response will return HTTP 200 and contain the pattern 'root:.*:0:0:' in the body, indicating /etc/passwd content was disclosed. ↗
• → The attack requires no authentication (PR:N, UI:N per CVSS), so unauthenticated GET requests with traversal payloads to /download/index.php should be flagged. ↗

• · Vulnerability affects BIQS IT Biqs-drive v1.83 and below only; v1.84+ is patched. ↗
• · File read is limited to the permissions of the configured web-user, not necessarily root-level access. ↗

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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

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