[GUACAMOLE-1017] Invalid UTF-8 string passed to pango_layout_set_text() -- leading to guacd segfault

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: guacd

Environment

CentOS 7, guacd 1.1.0-1 from EPEL

rpm -qa | grep guac
guacd-1.1.0-1.el7.x86_64
libguac-client-vnc-1.1.0-1.el7.x86_64
libguac-1.1.0-1.el7.x86_64
libguac-client-rdp-1.1.0-1.el7.x86_64
libguac-client-ssh-1.1.0-1.el7.x86_64

• Assignee: Unassigned
• Reporter: M J Harvey
• Created: 08/Apr/20 16:58
• Updated: 09/Apr/20 17:18

Description

Hi,

Probabilistic reproducible segfault of guacd:

• Installed guacd and guacamole from EPEL on a CentOS 7.7.1908 system.
• Configure an SSH connection type.
• Establish guacamole session to SSH server
• Do "cat /dev/urandom" to generate garbage.

• Observe /var/log/messages on the guacd server, you'll see frequent logs of "Invalid UTF-8 string passed to pango_layout_set_text()"

• Session will pretty rapidly terminate. About 20% of the time this is an uncontrolled segfault from libc

guacd[7688]: segfault at 7f3ea6177ff0 ip 00007f3ea3cb2b1d sp 00007f3e9d902ab8 error 4 in libc-2.17.so[7f3ea3b57000+1c3000]