A vulnerability, which was classified as critical, has been found in Debian ftpsync (affected version unknown). Affected by this issue is an unknown functionality of the component Option Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, and integrity. CVE summarizes:

Debian ftpsync before 20171017 does not use the rsync --safe-links option, which allows remote attackers to conduct directory traversal attacks via a crafted upstream mirror.

The bug was discovered 05/07/2017. The weakness was presented 10/17/2017 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is handled as CVE-2017-8805 since 05/07/2017. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1006.

The vulnerability was handled as a non-public zero-day exploit for at least 163 days. During that time the estimated underground price was around $5k-$25k.

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

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Vendor

• Debian

Name

• ftpsync

License

• open-source

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• 🔍

CPE 2.2info

• 🔍

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