USN-4246-1: zlib vulnerabilities
22 January 2020
Several security issues were fixed in zlib
Releases
Packages
- 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
-
lib32z1
-
1:1.2.8.dfsg-2ubuntu4.3
-
lib64z1
-
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
Related notices
- USN-4292-1: rsync
- USN-6736-1: libklibc-dev, klibc, klibc-utils, libklibc
- USN-6736-2: libklibc-dev, klibc, klibc-utils, libklibc