CVE-2023-48795
5.9 · MEDIUMOverview
CVE-2023-48795 is a medium-severity vulnerability affecting openbsd openssh. It was published on December 18, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. For example, there is an effective attack against SSH's use of ChaCha20-Poly1305 (and CBC with Encrypt-then-MAC). The bypass occurs in [email protected] and (if CBC is used) the [email protected] MAC algorithms. This also affects Maverick Synergy Java SSH API before 3.1.0-SNAPSHOT, Dropbear through 2022.83, Ssh before 5.1.1 in Erlang/OTP, PuTTY before 0.80, AsyncSSH before 2.14.2, golang.org/x/crypto before 0.17.0, libssh before 0.
Remediation
Check the references section for vendor advisories and patches from openbsd. Update openssh to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| openbsd | openssh | >= 0, < 9.6 | Affected |
| putty | putty | >= 0, < 0.80 | Affected |
| filezilla-project | filezilla_client | >= 0, < 3.66.4 | Affected |
| panic | transmit_5 | >= 0, < 5.10.4 | Affected |
| panic | nova | >= 0, < 11.8 | Affected |
| roumenpetrov | pkixssh | >= 0, < 14.4 | Affected |
| winscp | winscp | >= 0, < 6.2.2 | Affected |
| bitvise | ssh_client | >= 0, < 9.33 | Affected |
| bitvise | ssh_server | >= 0, < 9.32 | Affected |
| lancom-systems | lcos | 0 | Affected |
| vandyke | securecrt | >= 0, < 9.4.3 | Affected |
| libssh | libssh | >= 0, < 0.10.6 | Affected |
| ssh2_project | ssh2 | 0 | Affected |
| proftpd | proftpd | 0 | Affected |
References
Frequently Asked Questions
What is CVE-2023-48795?
CVE-2023-48795 is a medium-severity vulnerability affecting openbsd openssh. It was published on December 18, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
How severe is CVE-2023-48795?
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2023-48795?
Check the references section for vendor advisories and patches from openbsd. Update openssh to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2023-48795?
CyberStrike's AI-powered security agents can automatically detect CVE-2023-48795 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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