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36-Year-Old SCP Clients' Implementation Flaws Discovered

Submitted by Roy Schestowitz on Tuesday 15th of January 2019 05:07:07 PM Filed under
Security

A set of 36-year-old vulnerabilities has been uncovered in the Secure Copy Protocol (SCP) implementation of many client applications that can be exploited by malicious servers to overwrite arbitrary files in the SCP client target directory unauthorizedly.

Session Control Protocol (SCP), also known as secure copy, is a network protocol that allows users to securely transfer files between a local host and a remote host using RCP (Remote Copy Protocol) and SSH protocol.

In other terms, SCP, which dates back to 1983, is a secure version of RCP that uses authentication and encryption of SSH protocol to transfer files between a server and a client.

Discovered by Harry Sintonen, one of F-Secure's Senior Security Consultants, the vulnerabilities exist due to poor validations performed by the SCP clients, which can be abused by malicious servers or man-in-the-middle (MiTM) attackers to drop or overwrite arbitrary files on the client's system.

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scp client multiple vulnerabilities

Submitted by Roy Schestowitz on Tuesday 15th of January 2019 06:27:07 PM.
  • scp client multiple vulnerabilities

    Many scp clients fail to verify if the objects returned by the scp server match those
    it asked for. This issue dates back to 1983 and rcp, on which scp is based. A separate
    flaw in the client allows the target directory attributes to be changed arbitrarily.
    Finally, two vulnerabilities in clients may allow server to spoof the client output.

LWN: An ancient OpenSSH vulnerability

Submitted by Roy Schestowitz on Wednesday 16th of January 2019 05:31:50 AM.
  • An ancient OpenSSH vulnerability

    ities in the scp clients shipped with OpenSSH, PuTTY, and others. "Many scp clients fail to verify if the objects returned by the scp server match those it asked for. This issue dates back to 1983 and rcp, on which scp is based. A separate flaw in the client allows the target directory attributes to be changed arbitrarily. Finally, two vulnerabilities in clients may allow server to spoof the client output." The outcome is that a hostile (or compromised) server can overwrite arbitrary files on the client side. There do not yet appear to be patches available to address these problems.

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