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USN-4416-1: GNU C Library vulnerabilities

6 July 2020

Several security issues were fixed in GNU C Library.

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Details

Florian Weimer discovered that the GNU C Library incorrectly handled
certain memory operations. A remote attacker could use this issue to cause
the GNU C Library to crash, resulting in a denial of service, or possibly
execute arbitrary code. This issue only affected Ubuntu 16.04 LTS.
(CVE-2017-12133)

It was discovered that the GNU C Library incorrectly handled certain
SSE2-optimized memmove operations. A remote attacker could use this issue
to cause the GNU C Library to crash, resulting in a denial of service, or
possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS.
(CVE-2017-18269)

It was discovered that the GNU C Library incorrectly handled certain
pathname operations. A remote attacker could use this issue to cause the
GNU C Library to crash, resulting in a denial of service, or possibly
execute arbitrary code. This issue only affected Ubuntu 18.04 LTS.
(CVE-2018-11236)

It was discovered that the GNU C Library incorrectly handled certain
AVX-512-optimized mempcpy operations. A remote attacker could use this
issue to cause the GNU C Library to crash, resulting in a denial of
service, or possibly execute arbitrary code. This issue only affected
Ubuntu 18.04 LTS. (CVE-2018-11237)

It was discovered that the GNU C Library incorrectly handled certain
hostname loookups. A remote attacker could use this issue to cause the GNU
C Library to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-19591)

Jakub Wilk discovered that the GNU C Library incorrectly handled certain
memalign functions. A remote attacker could use this issue to cause the GNU
C Library to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2018-6485)

It was discovered that the GNU C Library incorrectly ignored the
LD_PREFER_MAP_32BIT_EXEC environment variable after security transitions. A
local attacker could use this issue to bypass ASLR restrictions.
(CVE-2019-19126)

It was discovered that the GNU C Library incorrectly handled certain
regular expressions. A remote attacker could possibly use this issue to
cause the GNU C Library to crash, resulting in a denial of service. This
issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-9169)

It was discovered that the GNU C Library incorrectly handled certain
bit patterns. A remote attacker could use this issue to cause the GNU C
Library to crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04
LTS. (CVE-2020-10029)

It was discovered that the GNU C Library incorrectly handled certain
signal trampolines on PowerPC. A remote 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-2020-1751)

It was discovered that the GNU C Library incorrectly handled tilde
expansion. A remote 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-2020-1752)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 19.10
Ubuntu 18.04
Ubuntu 16.04

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

Related notices

  • USN-6762-1: libc6-dev, libc6-dev-x32, eglibc-source, libc6-dev-amd64, libc6-amd64, libc-dev-bin, libc6-dev-i386, locales, libc6-s390, libc6-x32, libc6-dev-armel, glibc-doc, libc6, multiarch-support, libc6-dev-s390, glibc-source, libc-bin, locales-all, libc6-armel, eglibc, libc6-i386, libc6-prof, nscd, libc6-lse, glibc, libc6-pic
  • USN-4218-1: libnss-files-udeb, libc6-dev, libc0.3-prof, libc6-dev-x32, libc0.3-i686, libc6-mipsn32, libc6-ppc64, eglibc-source, libc0.1-dev-i386, libc6-dev-amd64, libc0.3-pic, libc6-dev-mips64, libc0.3-dev, libc6-loongson2f, libc6-xen, libc0.1-pic, libc6-i686, libc0.1, libc6.1-dev, libc0.1-udeb, libc0.1-i386, libc6-sparc, libc6-sparc64b, libc6-amd64, libc6-sparc64v2, libc6-armhf, libc-dev-bin, libc0.3-xen, libc6.1-udeb, libc6-dev-i386, libc6-powerpc, libc6-sparc64, libc6-s390, libc6-x32, libc6-dev-armel, libc6-s390x, glibc-doc, libc0.1-dev, libc6-dev-armhf, libc6, libc0.3, libc6-sparcv9v2, multiarch-support, libc6-mips64, libc0.3-udeb, libc6-sparcv9v, libc6-dev-s390, libnss-dns-udeb, libc6.1-pic, libc6-dev-powerpc, libc6-dev-sparc64, libc6-sparc64v, libc6.1-prof, libc0.1-i686, libc6-dev-sparc, libc-bin, libc6-dev-mipsn32, libc6-armel, eglibc, libc6-dev-ppc64, libc6-i386, libc6-prof, libc6-udeb, libc6.1-alphaev67, libc0.1-prof, nscd, libc6-dev-s390x, libc6-pic, libc6.1