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==========================================================================
Ubuntu Security Notice USN-4471-2
September 01, 2020

net-snmp regression
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM

Summary:

USN-4471-1 introduced a regression in Net-SNMP.

Software Description:
- net-snmp: SNMP (Simple Network Management Protocol) server and applications

Details:

USN-4471-1 fixed a vulnerability in Net-SNMP. The updated introduced a
 regression making
nsExtendCacheTime not settable. This update fixes the problem adding the
 cacheTime feature flag.

Original advisory details:

 Tobias Neitzel discovered that Net-SNMP incorrectly handled certain symlinks.
 An attacker could possibly use this issue to access sensitive information.
 (CVE-2020-15861)

 It was discovered that Net-SNMP incorrectly handled certain inputs.
 An attacker could possibly use this issue to execute arbitrary code.
 This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 LTS, Ubuntu
 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2020-15862)

Update instructions:

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

Ubuntu 18.04 LTS:
  libsnmp-base                    5.7.3+dfsg-1.8ubuntu3.6
  libsnmp-perl                    5.7.3+dfsg-1.8ubuntu3.6
  libsnmp30                       5.7.3+dfsg-1.8ubuntu3.6
  snmpd                           5.7.3+dfsg-1.8ubuntu3.6

Ubuntu 16.04 LTS:
  libsnmp-base                    5.7.3+dfsg-1ubuntu4.6
  libsnmp-perl                    5.7.3+dfsg-1ubuntu4.6
  libsnmp30                       5.7.3+dfsg-1ubuntu4.6
  snmpd                           5.7.3+dfsg-1ubuntu4.6

Ubuntu 14.04 ESM:
  libsnmp-base                    5.7.2~dfsg-8.1ubuntu3.3+esm2
  libsnmp-perl                    5.7.2~dfsg-8.1ubuntu3.3+esm2
  libsnmp30                       5.7.2~dfsg-8.1ubuntu3.3+esm2
  snmpd                           5.7.2~dfsg-8.1ubuntu3.3+esm2

After a standard system update you need to restart snmpd to make
all the necessary changes.

References:
  https://usn.ubuntu.com/4471-2
  https://usn.ubuntu.com/4471-1
  https://launchpad.net/bugs/1892980

Package Information:
  https://launchpad.net/ubuntu/+source/net-snmp/5.7.3+dfsg-1.8ubuntu3.6
  https://launchpad.net/ubuntu/+source/net-snmp/5.7.3+dfsg-1ubuntu4.6

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