CVE-2021-3800

A flaw was found in glib before version 2.63.6. Due to random charset alias, pkexec can leak content from files owned by privileged users to unprivileged ones under the right condition.

GLib provides the core application building blocks for libraries and applications written in C. It provides the core object system used in GNOME, the main loop implementation, and a large set of utility functions for strings and common data structures.

Security Fix(es):

• glib2: Possible privilege escalation thourgh pkexec and aliases (CVE-2021-3800)

• glib: g_file_replace() with G_FILE_CREATE_REPLACE_DESTINATION creates empty target for dangling symlink (CVE-2021-28153)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.5 Release Notes linked from the References section.

A flaw was found in glib before version 2.63.6. Due to random charset alias, pkexec can leak content from files owned by privileged users to unprivileged ones under the right condition.

GLib provides the core application building blocks for libraries and applications written in C. It provides the core object system used in GNOME, the main loop implementation, and a large set of utility functions for strings and common data structures.

Security Fix(es):

• glib2: Possible privilege escalation thourgh pkexec and aliases (CVE-2021-3800)

• glib: g_file_replace() with G_FILE_CREATE_REPLACE_DESTINATION creates empty target for dangling symlink (CVE-2021-28153)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

• SECURITY UPDATE: Privilege Escalation
  • debian/patches/CVE-2021-3800.patch: Drop a redundant environment variable in _g_locale_get_charset_aliases function at libcharset/localcharset.c.
  • CVE-2021-3800

• CVE-2021-3800: Fix privilege escalation

• CVE-2021-3800: Fix privilege escalation

• CVE-2021-28153: g_file_replace() with G_FILE_CREATE_REPLACE_DESTINATION creates empty target for dangling symlink (#1939118)
• CVE-2021-3800: Possible privilege escalation thourgh pkexec and aliases (#1938284)

This update for glib2 fixes the following issues:

• CVE-2021-3800: Fixed a file content leak in pkexec due to charset aliases (bsc#1191489).

It was discovered that GLib incorrectly handled certain environment variables. An attacker could possibly use this issue to escalate privileges.