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USN-4954-1: GNU C Library vulnerabilities

14 May 2021

Several security issues were fixed in GNU C Library.

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Releases

Packages

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)

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 16.04

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

Related notices

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