USN-5699-1: 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-2021-3326)

It was discovered that the GNU C Library nscd daemon incorrectly handled
certain netgroup lookups. An attacker could possibly use this issue to
cause the GNU C Library to crash, resulting in a denial of service.
(CVE-2021-35942)

Update instructions

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

Ubuntu 16.04

• libc6 - 2.23-0ubuntu11.3+esm2
  Available with Ubuntu Pro

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

References

• CVE-2021-3326
• CVE-2021-35942

Related notices

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