[USN-6736-2] klibc vulnerabilities

[Ian Constantin]

==========================================================================
Ubuntu Security Notice USN-6736-2
May 23, 2024

klibc vulnerabilities
==========================================================================

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

- Ubuntu 24.04 LTS

Summary:

Several security issues were fixed in klibc.

Software Description:
- klibc: small utilities built with klibc for early boot

Details:

USN-6736-1 fixed vulnerabilities in klibc. This update provides the
corresponding updates for Ubuntu 24.04 LTS.

Original advisory details:

  It was discovered that zlib, vendored in klibc, incorrectly handled 
pointer
  arithmetic. An attacker could use this issue to cause klibc to crash or to
  possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841)

  Danilo Ramos discovered that zlib, vendored in klibc, incorrectly handled
  memory when performing certain deflating operations. An attacker could use
  this issue to cause klibc to crash or to possibly execute arbitrary code.
  (CVE-2018-25032)

  Evgeny Legerov discovered that zlib, vendored in klibc, incorrectly 
handled
  memory when performing certain inflate operations. An attacker could use
  this issue to cause klibc to crash or to possibly execute arbitrary code.
  (CVE-2022-37434)

Update instructions:

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

Ubuntu 24.04 LTS
    klibc-utils                     2.0.13-4ubuntu0.1
    libklibc                         2.0.13-4ubuntu0.1

In general, a standard system update will make all the necessary changes.

References:
    https://ubuntu.com/security/notices/USN-6736-2
    https://ubuntu.com/security/notices/USN-6736-1
    CVE-2016-9840, CVE-2016-9841, CVE-2018-25032, CVE-2022-37434

Package Information:
    https://launchpad.net/ubuntu/+source/klibc/2.0.13-4ubuntu0.1

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