CVE-2023-35887 Apache MINA SSHD: Information disclosure bugs with RootedFilesystem
Attackers can discover file existence outside the root directory in SFTP servers using Apache MINA SSHD with RootedFileSystem.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-35887?
CVE-2023-35887 is a medium-severity path traversal vulnerability in Apache MINA SSHD, published on 10 Jul 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache Software Foundation Apache MINA.
In SFTP servers implemented using Apache MINA SSHD that use a RootedFileSystem, logged users may be able to discover "exists/does not exist" information about items outside the rooted tree via paths including parent navigation ("..") beyond the root, or involving symlinks.
This issue affects Apache MINA: from 1.0 before 2.10. Users are recommended to upgrade to 2.10
Weakness: CWE-22
Which versions are affected by CVE-2023-35887?
6 open source packages ship an affected version, including org.apache.sshd:sshd-common, org.apache.sshd:sshd-core and org.apache.sshd:sshd-sftp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.sshd:sshd-common Maven | From 2.1.0 | 2.9.3 |
org.apache.sshd:sshd-common Maven | From 2.1.0 | 2.9.3 |
org.apache.sshd:sshd-core Maven | From 1.0.0 | 2.1.0 |
org.apache.sshd:sshd-core Maven | From 1.0.0 | 2.1.0 |
org.apache.sshd:sshd-sftp Maven | From 1.0.0 | 2.9.3 |
org.apache.sshd:sshd-sftp Maven | From 1.0.0 | 2.9.3 |
Products include Apache Sshd.
How do I fix CVE-2023-35887?
Upgrade org.apache.sshd:sshd-common to 2.9.3 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2023-35887 being exploited?
There is no known exploitation of CVE-2023-35887 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Apache MINA SSHD
Sources
Also known as CLEANSTART-2026-DP56505, CLEANSTART-2026-EF36950, CLEANSTART-2026-PH67619, GHSA-mjmq-gwgm-5qhm, MINI-vw9x-whc4-x8rj, OESA-2024-1079.