The remote host is missing an update to git-core announced via advisory DSA 1841-2.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201841-2

A bug in git-core caused the security update in DSA 1841 to fail to build on a number of architectures Debian supports. This update corrects the bug and releases builds for all supported architectures. The original advisory is quoted in full below for reference. It was discovered that git-daemon which is part of git-core, a popular distributed revision control system, is vulnerable to denial of service attacks caused by a programming mistake in handling requests containing extra unrecognized arguments which results in an infinite loop. While this is no problem for the daemon itself as every request will spawn a new git-daemon instance, this still results in a very high CPU consumption and might lead to denial of service conditions. For the oldstable distribution (etch), this problem has been fixed in version 1.4.4.4-4+etch4. For the stable distribution (lenny), this problem has been fixed in version 1.5.6.5-3+lenny3. For the testing distribution (squeeze), this problem has been fixed in version 1:1.6.3.3-1. For the unstable distribution (sid), this problem has been fixed in version 1:1.6.3.3-1. We recommend that you upgrade your git-core packages.