USN-5768-1: GNU C Library vulnerabilities

Releases

• Ubuntu 16.04 ESM

Packages

• glibc - GNU C Library

Details

Jan Engelhardt, Tavis Ormandy, and others discovered that the GNU C Library
iconv feature incorrectly handled certain input sequences. An attacker
could possibly use this issue to cause the GNU C Library to hang or crash,
resulting in a denial of service. (CVE-2016-10228, CVE-2019-25013,
CVE-2020-27618)

It was discovered that the GNU C Library did not properly handled DNS
responses when ENDS0 is enabled. An attacker could possibly use this issue
to cause fragmentation-based attacks. (CVE-2017-12132)

Update instructions

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

Ubuntu 16.04

• libc6 - 2.23-0ubuntu11.3+esm3
  Available with Ubuntu Pro

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

References

• CVE-2019-25013
• CVE-2016-10228
• CVE-2020-27618
• CVE-2017-12132

Related notices

• USN-5310-1: locales-all, libc6-i386, libc-dev-bin, libc6-dev, libc-devtools, libc6-amd64, libc6-dev-i386, libc6-s390, libc6-pic, libc6-dev-armel, glibc-doc, libc6-dev-x32, libc6, libc6-x32, nscd, libc6-dev-s390, libc-bin, libc6-dev-amd64, libc6-prof, libc6-armel, libc6-lse, glibc, multiarch-support, glibc-source, locales