{"id":49708,"date":"2025-06-08T11:54:41","date_gmt":"2025-06-08T11:54:41","guid":{"rendered":""},"modified":"2025-09-07T11:38:01","modified_gmt":"2025-09-07T17:38:01","slug":"cve-2025-20668-critical-out-of-bounds-write-in-scp-leading-to-privilege-escalation","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-20668-critical-out-of-bounds-write-in-scp-leading-to-privilege-escalation\/","title":{"rendered":"CVE-2025-20668: Critical Out of Bounds Write in scp leading to Privilege Escalation<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

In a world where cybersecurity has become a significant concern for individuals and businesses alike, keeping track of vulnerabilities and assessing their potential impact is of paramount importance. One such vulnerability recently identified is CVE-2025-20668, a critical flaw in the Secure Copy Protocol (scp), which could potentially lead to local privilege escalation. This vulnerability affects all users of scp, a widely used method of securely transferring files between a local<\/a> and a remote host. The severity of this flaw cannot be overstated, given the potential consequences if exploited<\/a>.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-20668
\nSeverity: Critical, CVSS score of 7.8
\nAttack Vector: Local
\nPrivileges Required: System
\nUser Interaction: None
\nImpact: Potential system compromise<\/a> or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

scp | All versions prior<\/a> to patch ALPS09625562<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit works by taking advantage of an out of bounds write vulnerability due<\/a> to a missing bounds check within the scp implementation. An attacker, who has already obtained the System privilege, can use this flaw to write data beyond the allocated memory<\/a> area. This could potentially overwrite other important data and lead to unexpected behavior, including privilege escalation<\/a> and, in worst cases, a system compromise.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here’s a conceptual example of how this vulnerability might be exploited. This pseudocode simulates the scenario of an out-of-bounds write<\/a>:<\/p>\n

# Attacker already has System privileges\n$ whoami\nsystem\n# Attempt to copy a crafted file using scp\n$ scp crafted_file user@target:\/path\/to\/destination\n# The crafted_file triggers an out of bounds write in the scp process on the target system<\/code><\/pre>\n
In this example, `crafted_file` is a specially designed file that, when processed by scp, causes it to write data beyond its allocated memory<\/a> space. Please note that this is a simplified representation of the exploit and the actual exploit would likely involve more sophisticated techniques.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
To mitigate this vulnerability, users are advised to apply the vendor patch identified as ALPS09625562. In scenarios where applying the patch is not immediately feasible, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) is recommended as a temporary mitigation measure. However, these measures do not entirely eliminate the risk, but they can significantly reduce the likelihood of a successful exploit. Users are strongly encouraged to apply the patch as soon as possible to ensure maximum protection.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview In a world where cybersecurity has become a significant concern for individuals and businesses alike, keeping track of vulnerabilities and assessing their potential impact is of paramount importance. One such vulnerability recently identified is CVE-2025-20668, a critical flaw in the Secure Copy Protocol (scp), which could potentially lead to local privilege escalation. This vulnerability […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[86,76],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-49708","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-privilege-escalation"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t