less through 653 allows OS command execution via a newline character in the name of a file, because quoting is mishandled in filename.c. Exploitation typically requires use with attacker-controlled file names, such as the files extracted from an untrusted archive. Exploitation also requires the LESSOPEN environment variable, but this is set by default in many common cases. An OS command injection flaw was found in Less. Since quoting is mishandled in filename.c, opening files with attacker-controlled file names can lead to OS command execution. Exploitation requires the LESSOPEN environment variable, which is set by default in many common cases.
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center