==========================================================================
Ubuntu Security Notice USN-4246-1
January 22, 2020
zlib vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in zlib
Software Description:
– zlib: Lossless data-compression library
Details:
It was discovered that zlib incorrectly handled pointer arithmetic. An
attacker
could use this issue to cause zlib to crash, resulting in a denial of
service, or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841)
It was discovered that zlib incorrectly handled vectors involving left
shifts of
negative integers. An attacker could use this issue to cause zlib to
crash, resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2016-9842)
It was discovered that zlib incorrectly handled vectors involving
big-endian CRC
calculation. An attacker could use this issue to cause zlib to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2016-9843)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS:
lib32z1 1:1.2.8.dfsg-2ubuntu4.3
lib64z1 1:1.2.8.dfsg-2ubuntu4.3
libn32z1 1:1.2.8.dfsg-2ubuntu4.3
libx32z1 1:1.2.8.dfsg-2ubuntu4.3
zlib1g 1:1.2.8.dfsg-2ubuntu4.3
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4246-1
CVE-2016-9840, CVE-2016-9841, CVE-2016-9842, CVE-2016-9843
Package Information:
https://launchpad.net/ubuntu/+source/zlib/1:1.2.8.dfsg-2ubuntu4.3
—–BEGIN PGP SIGNATURE—–
iQEzBAEBCAAdFiEElnO/d49FoUPK9fwytGdj0GOh2+wFAl4otpgACgkQtGdj0GOh
2+x46QgAkxwlCswshL4FEjswUvbMpPO4Ox9QAKrpNzWwEYdHKCJpnb+f6ksjJ+aT
sD65jZI0y0cKB25lgvTl+gd1vLT0Gb/+TszCI8ISwJzQAleN5D5RFQCuHwMSsMhZ
cJK1oXlFwXCwNtGaNFEA56kgTk4v66vBmqJcsjkflB6zJUaleLlTyVIfCEbiFoTk
kcmurwmhj5rjQedyR0pPi4JIR4CPnDSlizAM05xS5L46auU3CUjgDMvwIsGCbE5d
Agt6SHfbFhEiEW/3sXy0FVFnGapgxr83aFi2BuH3xZYy1Y1epvr+9UJEKdJFiWAL
J21ucoJbu6RfkIq8L19DwKDu1XFcJg==
=6qZm
—–END PGP SIGNATURE—–
—
