View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2011-4407 medium priority: Ubuntu including 1 source packages (software-properties), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): released 4, ignored 1, needs-triage 1.
ppa.py in Software Properties before 0.81.13.3 does not validate the server certificate when downloading PPA GPG key fingerprints, which allows man-in-the-middle (MITM) attackers to spoof GPG keys for a package repository.