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AUSCERT External Security Bulletin Redistribution
ESB-2020.0668
USN-4292-1: rsync vulnerabilities
25 February 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: rsync
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-9843 CVE-2016-9842 CVE-2016-9841
CVE-2016-9840
Reference: ASB-2018.0258
ASB-2018.0164
ESB-2020.0333
ESB-2020.0238
Original Bulletin:
https://usn.ubuntu.com/4292-1/
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USN-4292-1: rsync vulnerabilities
25 February 2020
rsync vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Summary
Several security issues were fixed in rsync.
Software Description
o rsync - fast, versatile, remote (and local) file-copying tool
Details
It was discovered that rsync incorrectly handled pointer arithmetic in zlib. An
attacker could use this issue to cause rsync to crash, resulting in a denial of
service, or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841)
It was discovered that rsync incorrectly handled vectors involving left shifts
of negative integers in zlib. An attacker could use this issue to cause rsync
to crash, resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2016-9842)
It was discovered that rsync incorrectly handled vectors involving big-endian
CRC calculation in zlib. An attacker could use this issue to cause rsync 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 18.04 LTS
rsync - 3.1.2-2.1ubuntu1.1
Ubuntu 16.04 LTS
rsync - 3.1.1-3ubuntu1.3
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
In general, a standard system update will make all the necessary changes.
References
o CVE-2016-9840
o CVE-2016-9841
o CVE-2016-9842
o CVE-2016-9843
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