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==========================================================================
Ubuntu Security Notice USN-5310-2
March 07, 2022

glibc vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in GNU C Library.

Software Description:
- glibc: GNU C Library

Details:

USN-5310-1 fixed several vulnerabilities in GNU. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

 It was discovered that the GNU C library getcwd function incorrectly
 handled buffers. An attacker could use this issue to cause the GNU C
 Library to crash, resulting in a denial of service, or possibly execute
 arbitrary code. (CVE-2021-3999)

 It was discovered that the GNU C Library sunrpc module incorrectly handled
 buffer lengths. An attacker could possibly use this issue to cause the GNU
 C Library to crash, resulting in a denial of service. (CVE-2022-23218,
 CVE-2022-23219)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 ESM:
  libc6                           2.23-0ubuntu11.3+esm1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5310-2
  https://ubuntu.com/security/notices/USN-5310-1
  CVE-2021-3999, CVE-2022-23218, CVE-2022-23219

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