USN-6736-1: klibc vulnerabilities

Releases

• Ubuntu 23.10
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• klibc - small utilities built with klibc for early boot

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 23.10

• klibc-utils - 2.0.13-1ubuntu0.1
• libklibc - 2.0.13-1ubuntu0.1

Ubuntu 22.04

• klibc-utils - 2.0.10-4ubuntu0.1
• libklibc - 2.0.10-4ubuntu0.1

Ubuntu 20.04

• klibc-utils - 2.0.7-1ubuntu5.2
• libklibc - 2.0.7-1ubuntu5.2

Ubuntu 18.04

• klibc-utils - 2.0.4-9ubuntu2.2+esm1
  Available with Ubuntu Pro
• libklibc - 2.0.4-9ubuntu2.2+esm1
  Available with Ubuntu Pro

Ubuntu 16.04

• klibc-utils - 2.0.4-8ubuntu1.16.04.4+esm2
  Available with Ubuntu Pro
• libklibc - 2.0.4-8ubuntu1.16.04.4+esm2
  Available with Ubuntu Pro

Ubuntu 14.04

• klibc-utils - 2.0.3-0ubuntu1.14.04.3+esm3
  Available with Ubuntu Pro
• libklibc - 2.0.3-0ubuntu1.14.04.3+esm3
  Available with Ubuntu Pro

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

References

• CVE-2018-25032
• CVE-2016-9840
• CVE-2022-37434
• CVE-2016-9841

Related notices

• USN-5355-1: lib64z1-dev, zlib1g-dev, libx32z1, lib32z1, zlib, zlib1g, libx32z1-dev, lib64z1, lib32z1-dev
• USN-5355-2: zlib-bin, lib64z1-dev, zlib1g-dev, libx32z1, lib32z1, zlib, zlib1g, libx32z1-dev, lib64z1, lib32z1-dev
• USN-5359-1: rsync
• USN-5359-2: rsync
• USN-5739-1: libmariadb-dev, mariadb-server, mariadb-plugin-spider, mariadb-client-core-10.3, mariadb-server-10.3, mariadb-plugin-gssapi-server, mariadb-test, libmariadb-dev-compat, mariadb-client-10.6, mariadb-plugin-oqgraph, mariadb-common, libmariadbd19, mariadb-plugin-s3, libmariadb3, libmariadbclient-dev, libmariadbd-dev, mariadb-plugin-tokudb, mariadb-test-data, mariadb-plugin-cracklib-password-check, mariadb-client-core-10.6, mariadb-backup, mariadb-10.3, mariadb-10.6, mariadb-client, mariadb-server-10.6, mariadb-client-10.3, mariadb-plugin-connect, mariadb-plugin-gssapi-client, mariadb-plugin-mroonga, mariadb-server-core-10.3, mariadb-server-core-10.6, mariadb-plugin-rocksdb
• USN-6736-2: klibc, klibc-utils, libklibc-dev, libklibc
• USN-4246-1: lib64z1-dev, zlib1g-dev, libx32z1, lib32z1, zlib, zlib1g, libx32z1-dev, lib64z1, zlib1g-udeb, lib32z1-dev
• USN-4292-1: rsync
• USN-5570-1: zlib-bin, lib64z1-dev, zlib1g-dev, libx32z1, lib32z1, zlib, zlib1g, libx32z1-dev, lib64z1, lib32z1-dev
• USN-5573-1: rsync
• USN-5570-2: lib64z1-dev, zlib1g-dev, libx32z1, lib32z1, zlib, zlib1g, libx32z1-dev, lib64z1, lib32z1-dev