The MITRE CVE dictionary describes this issue as:
Directory traversal vulnerability in the extract_jar function in jartool.c in FastJar 0.98 allows remote attackers to create or overwrite arbitrary files via a .. (dot dot) in a non-initial pathname component in a filename within a .jar archive, a related issue to CVE-2005-1080. NOTE: this vulnerability exists because of an incomplete fix for CVE-2006-3619.
Find out more about CVE-2010-0831 from the
MITRE CVE dictionary dictionary and
The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw.