CVE-2024-7922 in DNS-120
Summary
by MITRE • 08/19/2024
A vulnerability was found in D-Link DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, DNS-323, DNS-325, DNS-326, DNS-327L, DNR-326, DNS-340L, DNS-343, DNS-345, DNS-726-4, DNS-1100-4, DNS-1200-05 and DNS-1550-04 up to 20240814 and classified as critical. Affected by this issue is the function cgi_audio_search/cgi_create_playlist/cgi_get_album_all_tracks/cgi_get_alltracks_editlist/cgi_get_artist_all_album/cgi_get_genre_all_tracks/cgi_get_tracks_list/cgi_set_airplay_content/cgi_write_playlist of the file /cgi-bin/myMusic.cgi. The manipulation leads to command injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. NOTE: Vendor was contacted early and confirmed that the product is end-of-life. It should be retired and replaced.
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Analysis
by VulDB Data Team • 08/21/2024
This critical vulnerability exists in multiple D-Link network-attached storage devices including DNS-120, DNR-202L, DNS-315L, DNS-320, DNS-320L, DNS-320LW, DNS-321, DNR-322L, DNS-323, DNS-325, DNS-326, DNS-327L, DNR-326, DNS-340L, DNS-343, DNS-345, DNS-726-4, DNS-1100-4, DNS-1200-05, and DNS-1550-04 models. The flaw resides in the myMusic.cgi script within the web application interface, specifically affecting several audio-related CGI functions that handle music library management operations. These functions include cgi_audio_search, cgi_create_playlist, cgi_get_album_all_tracks, cgi_get_alltracks_editlist, cgi_get_artist_all_album, cgi_get_genre_all_tracks, cgi_get_tracks_list, cgi_set_airplay_content, and cgi_write_playlist. The vulnerability has been assigned a critical severity rating by the National Vulnerability Database and represents a command injection flaw that allows remote attackers to execute arbitrary commands on the affected devices.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the affected CGI functions. When users interact with the audio management features through the web interface, the application fails to properly sanitize user-supplied parameters before passing them to system commands. This allows an attacker to inject malicious commands that get executed with the privileges of the web server process, typically running as root or with elevated system permissions. The attack vector is entirely remote, meaning no physical access or local network credentials are required to exploit the vulnerability. Attackers can leverage this weakness to gain complete control over the affected devices, potentially enabling them to execute arbitrary code, access sensitive data, modify system configurations, or even establish persistent backdoors.
The operational impact of this vulnerability is severe given that these devices are typically deployed in home and small office environments where they serve as network storage solutions and media servers. An attacker who successfully exploits this vulnerability could potentially access all files stored on the device, including personal documents, media collections, and potentially sensitive information. The affected devices may also be used as launching points for further attacks within the local network, as they often serve as central points of connectivity for various networked devices. Additionally, the exploitation could lead to complete compromise of the device's functionality, rendering it inoperable or allowing attackers to use it for malicious activities such as botnet participation or as a pivot point for attacking other networked systems. The fact that these devices are end-of-life products means they no longer receive security updates, making them particularly vulnerable to exploitation.
The vulnerability aligns with CWE-77 and CWE-78 categories from the Common Weakness Enumeration, specifically representing command injection flaws where untrusted data is incorporated into system commands without proper sanitization. From an adversary perspective, this vulnerability maps to multiple ATT&CK techniques including T1059.001 for command and scripting interpreter, T1021.004 for remote services, and T1566 for phishing with malicious attachments or links. The public disclosure of the exploit increases the risk significantly as it provides threat actors with readily available attack tools. Organizations and individuals should immediately cease using these vulnerable devices and replace them with supported alternatives. The vendor has confirmed these products are end-of-life, which means no further security patches or support will be provided, making retirement and replacement the only viable mitigation strategy. Any device still in use should be isolated from critical network segments and monitored for potential compromise indicators.