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Debian LTS Advisory DLA-3044-1                [email protected]
https://www.debian.org/lts/security/                      Markus Koschany
June 06, 2022                                 https://wiki.debian.org/LTS
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Package        : glib2.0
Version        : 2.50.3-2+deb9u3
CVE ID         : CVE-2021-27218 CVE-2021-27219 CVE-2021-28153
Debian Bug     : 984969 982778 982779

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

CVE-2021-27218

  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.

CVE-2021-27219

  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.

CVE-2021-28153

  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 9 stretch, these problems have been fixed in version
2.50.3-2+deb9u3.

We recommend that you upgrade your glib2.0 packages.

For the detailed security status of glib2.0 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/glib2.0

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS