CVE-2017-16877

published 2017-11-17

CVE-2017-16877: ZEIT Next.js before 2.4.1 has directory traversal under the /_next and /static request namespace, allowing attackers to obtain sensitive information.

Priority P3 55 high 7.5 CVSS 3.0

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

EXPLOIT

ZEIT Next.js before 2.4.1 has directory traversal under the /_next and /static request namespace, allowing attackers to obtain sensitive information.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
next	next	>= 1.0.0 < 2.4.1	2.4.1
zeit	next.js	< 2.4.1	2.4.1

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

url {{BaseURL}}/_next/../../../../../../../../../../etc/passwd↗

path /_next/../../../../../../../../../../etc/passwd↗

• → Exploit path traversal via the /_next namespace by appending directory traversal sequences (../../) to reach sensitive files like /etc/passwd. A successful response returns HTTP 200 with passwd file content matching root:.*:0:0: ↗
• → Monitor HTTP GET requests to paths beginning with /_next/ or /static/ that contain ../ sequences, indicating directory traversal attempts against vulnerable Next.js instances. ↗
• → Use Shodan query 'http.html:"/_next/static"' or FOFA query 'body="/_next/static"' to identify internet-exposed Next.js instances potentially vulnerable to CVE-2017-16877. ↗

• · Vulnerability affects only Next.js versions prior to 2.4.1. Instances running 2.4.1 or later are not affected. ↗

CVSS provenance

nvd v3.0 7.5 HIGH CVSS:3.0/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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