Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | jsch | 0.1.54-1 | — |
| Debian 13 | jsch | 0.1.54-1 | — |
| Debian 12 | jsch | 0.1.54-1 | — |
| Debian 8 | jsch | 0.1.51-1+deb8u1 | DLA-2184-1 |
| Debian 7 | jsch | 0.1.42-2+deb7u1 | DLA-611-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Manager Server 3.0 | jsch | 0.1.54-3.1 | SUSE-SU-2017:0715-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- JCraft/JSch Java Secure Channel 0.1.53 - Recursive sftp-get Directory Traversal EDB-40411 · dos · Sep 22, 2016 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | com.jcraft:jsch | < 0.1.54 | 0.1.54 | GHSA-q446-82vq-w674 |
Advisories 4
- DLA-611-1 jsch - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2184-1 jsch - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:0715-1 Security update for jsch SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-0720 Red Hat JBoss: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 22, 2023
References
- 20160921 CVE-2016-5725 - JCraft/JSch Java Secure Channel <= 0.1.53 recursive sftp-get path traversal (client-side, windows) mailing-list
- 93100 vdb-entry
- RHSA-2017:3115 vendor-advisory
- 40411 exploit
- [debian-lts-announce] 20200425 [SECURITY] [DLA 2184-1] jsch security update mailing-list
- https://www.oracle.com/security-alerts/cpuoct2020.html
- http://packetstormsecurity.com/files/138809/jsch-0.1.53-Path-Traversal.html
- https://github.com/tintinweb/pub/tree/master/pocs/cve-2016-5725
- http://www.jcraft.com/jsch/ChangeLog
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.oracle.com/security-alerts/cpuApr2021.html