The remote host is missing an update to git-core announced via advisory DSA 1708-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201708-1

It was discovered that gitweb, the web interface for the Git version control system, contained several vulnerabilities: Remote attackers could use crafted requests to execute shell commands on the web server, using the snapshot generation and pickaxe search functionality (CVE-2008-5516). Local users with write access to the configuration of a Git repository served by gitweb could cause gitweb to execute arbitrary shell commands with the permission of the web server (CVE-2008-5517). For the stable distribution (etch), these problems have been fixed in version 1.4.4.4-4+etch1. For the unstable distribution (sid) and testing distribution (lenny), the remote shell command injection issuei (CVE-2008-5516) has been fixed in version 1.5.6-1. The other issue will be fixed soon. We recommend that you upgrade your Git packages.