USN-4954-1: GNU C Library vulnerabilities

Releases

• Ubuntu 16.04 ESM

Packages

• glibc - GNU C Library

Details

Jason Royes and Samuel Dytrych discovered that the memcpy()
implementation for 32 bit ARM processors in the GNU C Library contained
an integer underflow vulnerability. An attacker could possibly use
this to cause a denial of service (application crash) or execute
arbitrary code. (CVE-2020-6096)

It was discovered that the POSIX regex implementation in the GNU C
Library did not properly parse alternatives. An attacker could use this
to cause a denial of service. (CVE-2009-5155)

Update instructions

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

Ubuntu 16.04

• libc6 - 2.23-0ubuntu11.3

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

References

• CVE-2009-5155
• CVE-2020-6096

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