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Ubuntu Security Notice USN-3855-1

Ubuntu Security Notice USN-3855-1
Posted Jan 11, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3855-1 - It was discovered that systemd-journald allocated variable-length buffers for certain message fields on the stack. A local attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. It was discovered that systemd-journald allocated variable-length arrays of objects representing message fields on the stack. A local attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2018-16864, CVE-2018-16865, CVE-2018-16866
MD5 | 42433c95e77000de53479462231b8fa3

Ubuntu Security Notice USN-3855-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3855-1
January 11, 2019

systemd vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in systemd.

Software Description:
- systemd: system and service manager

Details:

It was discovered that systemd-journald allocated variable-length buffers
for certain message fields on the stack. A local attacker could
potentially exploit this to cause a denial of service, or execute
arbitrary code. (CVE-2018-16864)

It was discovered that systemd-journald allocated variable-length arrays
of objects representing message fields on the stack. A local attacker
could potentially exploit this to cause a denial of service, or execute
arbitrary code. (CVE-2018-16865)

An out-of-bounds read was discovered in systemd-journald. A local
attacker could potentially exploit this to obtain sensitive information
and bypass ASLR protections. (CVE-2018-16866)

Update instructions:

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

Ubuntu 18.10:
systemd 239-7ubuntu10.6

Ubuntu 18.04 LTS:
systemd 237-3ubuntu10.11

Ubuntu 16.04 LTS:
systemd 229-4ubuntu21.15

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

References:
https://usn.ubuntu.com/usn/usn-3855-1
CVE-2018-16864, CVE-2018-16865, CVE-2018-16866

Package Information:
https://launchpad.net/ubuntu/+source/systemd/239-7ubuntu10.6
https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.11
https://launchpad.net/ubuntu/+source/systemd/229-4ubuntu21.15

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