Ubuntu Security Notice 850-2 – USN-850-1 fixed vulnerabilities in poppler. The security fix for CVE-2009-3605 introduced a regression that would cause certain applications, such as Okular, to segfault when opening certain PDF files. This update fixes the problem. It was discovered that poppler contained multiple security issues when parsing malformed PDF documents. If a user or automated system were tricked into opening a crafted PDF file, an attacker could cause a denial of service or execute arbitrary code with privileges of the user invoking the program.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/82160/USN-850-2.txt
Source: https://packetstormsecurity.com/files/82160/Ubuntu-Security-Notice-850-2.html