GNU screen 4.0.3 allows local users to unlock the screen via a CTRL-C sequence at the password prompt. NOTE: multiple third parties report inability to reproduce this issue
lists.grok.org.uk/pipermail/full-disclosure/2007-June/063706.html
lists.grok.org.uk/pipermail/full-disclosure/2007-June/063710.html
lists.grok.org.uk/pipermail/full-disclosure/2007-June/063721.html
lists.grok.org.uk/pipermail/full-disclosure/2007-June/063728.html
exchange.xforce.ibmcloud.com/vulnerabilities/34693