USN-4587-1: iTALC vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
Ubuntu 16.04 LTS
Several security issues were fixed in iTALC.
italc - didact tool which allows teachers to view and control computer labs
Nicolas Ruff discovered that iTALC had buffer overflows, divide-by-zero errors and didn’t check malloc return values. A remote attacker could use these issues to cause a denial of service or possibly execute arbitrary code. (CVE-2014-6051, CVE-2014-6052, CVE-2014-6053, CVE-2014-6054, CVE-2014-6055)
Josef Gajdusek discovered that iTALC had heap-based buffer overflow vulnerabilities. A remote attacker could used these issues to cause a denial of service or possibly execute arbitrary code. (CVE-2016-9941, CVE-2016-9942)
It was discovered that iTALC had an out-of-bounds write, multiple heap out-of-bounds writes, an infinite loop, improper initializations, and null pointer vulnerabilities. A remote attacker could used these issues to cause a denial of service or possibly execute arbitrary code. (CVE-2018-15127, CVE-2018-20019, CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20023, CVE-2018-20024, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-7225, CVE-2019-15681)
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 LTS
italc-client - 1:2.0.2+dfsg1-4ubuntu0.1
italc-master - 1:2.0.2+dfsg1-4ubuntu0.1
libitalccore - 1:2.0.2+dfsg1-4ubuntu0.1
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.