CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
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5.5 | $0-$5k | 0.00 |
A vulnerability was found in Jcraft jsch 0.1.53 on Windows. It has been rated as critical. This issue affects some unknown functionality of the component sftp. The manipulation with an unknown input leads to a path traversal vulnerability (Client). 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. The summary by CVE is:
Directory traversal vulnerability in JCraft JSch before 0.1.54 on Windows, when the mode is ChannelSftp.OVERWRITE, allows remote SFTP servers to write to arbitrary files via a ..\ (dot dot backslash) in a response to a recursive GET command.
The weakness was published 09/21/2016 by tintinweb as not defined mailinglist post (Full-Disclosure). It is possible to read the advisory at seclists.org. The identification of this vulnerability is CVE-2016-5725 since 06/18/2016. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK. The advisory points out:
A malicious sftp server may force a client-side relative path traversal in jsch's implementation for recursive sftp-get allowing the server to write files outside the clients download basedir with effective permissions of the jsch sftp client process.
A public exploit has been developed by Sebastian Deiss in Python and been published immediately after the advisory. The exploit is available at github.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 93323 (Debian DLA-611-1 : jsch security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l.
Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. A possible mitigation has been published even before and not after the disclosure of the vulnerability.
The vulnerability is also documented in the databases at Tenable (93323) and Exploit-DB (40411).
Product
Vendor
Name
Version
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
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CVSSv3
VulDB Meta Base Score: 5.9VulDB Meta Temp Score: 5.5
VulDB Base Score: 5.9
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 5.9
NVD Vector: 🔍
CVSSv2
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VulDB Base Score: 🔍
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Exploiting
Name: ClientClass: Path traversal / Client
CWE: CWE-22
ATT&CK: T1006
Local: No
Remote: Yes
Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Sebastian Deiss
Programming Language: 🔍
Download: 🔍
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
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Nessus ID: 93323
Nessus Name: Debian DLA-611-1 : jsch security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Exploit-DB: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
0-Day Time: 🔍
Exploit Delay Time: 🔍
Patch: github.com
Timeline
06/18/2016 🔍08/31/2016 🔍
09/05/2016 🔍
09/06/2016 🔍
09/21/2016 🔍
09/21/2016 🔍
09/22/2016 🔍
01/19/2017 🔍
09/19/2022 🔍
Sources
Advisory: RHSA-2017:3115Researcher: tintinweb
Status: Not defined
Confirmation: 🔍
CVE: CVE-2016-5725 (🔍)
SecurityFocus: 93100 - JCraft JSch CVE-2016-5725 Directory Traversal Vulnerability
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 09/22/2016 12:20Updated: 09/19/2022 14:57
Changes: 09/22/2016 12:20 (68), 04/22/2019 20:31 (14), 09/19/2022 14:57 (3)
Complete: 🔍
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