ELA-625-1 glib2.0 security update

several vulnerabilities

Related CVEs CVE-2021-27218 CVE-2021-27219 CVE-2021-28153

Several security vulnerabilities were found in glib2.0, a general-purpose utility library for the GNOME environment.


If g_byte_array_new_take() was called with a buffer of 4GB or more on a
64-bit platform, the length would be truncated modulo 2**32, causing
unintended length truncation.


The function g_bytes_new has an integer overflow on 64-bit platforms due to
an implicit cast from 64 bits to 32 bits. The overflow could potentially
lead to memory corruption.


When g_file_replace() is used with G_FILE_CREATE_REPLACE_DESTINATION to
replace a path that is a dangling symlink, it incorrectly also creates the
target of the symlink as an empty file, which could conceivably have
security relevance if the symlink is attacker-controlled. (If the path is
a symlink to a file that already exists, then the contents of that file
correctly remain unchanged.)

For Debian 8 jessie, these problems have been fixed in version 2.42.1-1+deb8u4.

We recommend that you upgrade your glib2.0 packages.

Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/