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Ubuntu 16.04 LTS: USN-4524-1 Critical: TNEF DoS And File Write Issue

ubuntu
Calendar Grey September 21, 2020
Dist Ubuntu Esm H88
The recently discovered TNEF weakness permits system crashes or unauthorized file modifications on Ubuntu 16.04 LTS. Ensure you update immediately to protect your system!
TNEF could be made to crash or write arbitrary files to the filesystem.

Summary

TNEF could be made to crash or write arbitrary files to the filesystem.

Software Description:

- tnef: Tool to unpack MIME application/ms-tnef attachments

Details:

Paul Dreik discovered that TNEF incorrectly handled filenames. If a user

were tricked into opening a specially crafted email attachment, an

attacker could possibly use this issue to write arbitrary files to the

filesystem or cause TNEF crash, resulting in a denial of service.

(CVE-2019-18849)

Topics%20covered

Topics Covered

security advisory DoS Ubuntu file system tnef arbitrary file writing

Update Instructions

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

Ubuntu 16.04 LTS:
  tnef                            1.4.9-1+deb8u4build0.16.04.1

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4524-1

CVE-2019-18849

Severity
critical
Lowest
Low
Medium
High
Critical

September 21, 2020

Topics%20covered

Topics Covered

security advisory DoS Ubuntu file system tnef arbitrary file writing

Package Information

https://launchpad.net/ubuntu/+source/tnef/1.4.9-1+deb8u4build0.16.04.1

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