Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-28518 is a path traversal vulnerability in OpenViking versions 0.2.1 and earlier, specifically in the .ovpack import functionality. The vulnerability allows attackers to craft malicious ZIP archives containing unsafe pathnames such as directory traversal sequences (e.g., "../"), absolute paths, or Windows drive letter prefixes (e.g., "C:"). When these archives are imported, the software improperly validates the paths of the archive members, enabling attackers to write or overwrite files outside the intended import directory.'}, {'type': 'paragraph', 'content': 'This flaw arises because the import process does not rigorously check each zip entry path before extraction, allowing malicious files to escape the designated extraction folder and potentially overwrite arbitrary files with the privileges of the importing process.'}] [2, 3]

Useful 0 Not Useful 0

Impact Analysis

[{'type': 'paragraph', 'content': "This vulnerability can have serious impacts including unauthorized modification or creation of files outside the intended directory. An attacker who successfully exploits this flaw can overwrite critical system or application files, potentially leading to data corruption, system instability, or privilege escalation depending on the importing process's permissions."}, {'type': 'paragraph', 'content': "Because the attacker can write files with the importing process's privileges, this could lead to compromise of confidentiality, integrity, and availability of the affected system or application."}] [2]

Useful 0 Not Useful 0

Compliance Impact

I don't know

Useful 0 Not Useful 0

Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by examining .ovpack ZIP archives for unsafe path entries such as directory traversal sequences (e.g., "../"), absolute paths (starting with "/"), Windows drive letter prefixes (e.g., "C:"), or backslash characters ("\\").'}, {'type': 'paragraph', 'content': 'To detect potentially malicious .ovpack files on your system, you can inspect the contents of these ZIP archives for unsafe paths before importing them.'}, {'type': 'paragraph', 'content': 'Suggested commands include using standard ZIP inspection tools to list archive contents and grep for suspicious patterns. For example:'}, {'type': 'list_item', 'content': 'Use unzip or zipinfo to list archive contents: unzip -l suspicious.ovpack'}, {'type': 'list_item', 'content': "Use unzip combined with grep to find entries with traversal or absolute paths: unzip -l suspicious.ovpack | grep -E '(\\.{2}/|^/|^[A-Za-z]:)'"}, {'type': 'list_item', 'content': 'Alternatively, use a script or tool that validates each ZIP member path against rules such as rejecting empty paths, backslashes, absolute paths, drive prefixes, and any ".." segments, similar to the validation implemented in the fix commit.'}] [1, 3]

Useful 0 Not Useful 0

Mitigation Strategies

The immediate mitigation step is to upgrade OpenViking to a version that includes the fix from commit 46b3e76, which enforces strict validation of .ovpack import paths to prevent path traversal.

If upgrading is not immediately possible, avoid importing untrusted or suspicious .ovpack archives, especially those obtained from unverified sources.

Additionally, implement manual or automated checks on .ovpack files before import to detect and reject archives containing unsafe paths such as traversal sequences, absolute paths, or Windows drive prefixes.

Restrict the privileges of the importing process to minimize potential damage if exploitation occurs.

Useful 0 Not Useful 0