Ubuntu Security Notice USN-5969-1

=========================================================================Ubuntu Security Notice USN-5969-1March 23, 2023gif2apng vulnerabilities=========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 20.04 LTS- Ubuntu 18.04 LTS- Ubuntu 16.04 ESMSummary:Several security issues were fixed in gif2apng.Software Description:- gif2apng: tool for converting animated GIF images to APNG formatDetails:It was discovered that gif2apng contained multiple heap-base overflows. Anattacker could potentially exploit this to cause a denial of service (systemcrash). (CVE-2021-45909, CVE-2021-45910, CVE-2021-45911)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 20.04 LTS:  gif2apng                        1.9+srconly-3ubuntu0.1Ubuntu 18.04 LTS:  gif2apng                        1.9+srconly-2ubuntu0.1Ubuntu 16.04 ESM:  gif2apng                        1.7-3ubuntu0.1~esm1In general, a standard system update will make all the necessary changes.References:  https://ubuntu.com/security/notices/USN-5969-1  CVE-2021-45909, CVE-2021-45910, CVE-2021-45911Package Information:  https://launchpad.net/ubuntu/+source/gif2apng/1.9+srconly-3ubuntu0.1  https://launchpad.net/ubuntu/+source/gif2apng/1.9+srconly-2ubuntu0.1