The remote host is missing an update to git-core announced via advisory DSA 1637-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201637-1

Multiple vulnerabilities have been identified in git-core, the core of the git distributed revision control system. Improper path length limitations in git's diff and grep functions, in combination with maliciously crafted repositories or changes, could enable a stack buffer overflow and potentially the execution of arbitrary code. The Common Vulnerabilities and Exposures project identifies this vulnerabilitiy as CVE-2008-3546. For the stable distribution (etch), this problem has been fixed in version 1.4.4.4-2.1+etch1. For the unstable distribution (sid), this problem has been fixed in version 1.5.6.5-1. We recommend that you upgrade your git-core packages.