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Ubuntu LTS: USN-4471-2 Moderate: Net-SNMP Regression Issue

ubuntu
Calendar Grey September 1, 2020
Dist Ubuntu Esm H88
Addressing the net-snmp regression challenge outlined in USN-4471-1, particularly for users on the Ubuntu platform, while guaranteeing system resilience.
USN-4471-1 introduced a regression in Net-SNMP.

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)

Topics%20covered

Topics Covered

security advisory code execution Ubuntu information disclosure net-snmp attack vector regression

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://ubuntu.com/security/notices/USN-4471-2

https://ubuntu.com/security/notices/USN-4471-1

https://bugs.launchpad.net/ubuntu/+source/net-snmp/+bug/1892980

Severity
important
Lowest
Low
Medium
High
Critical

September 01, 2020

Topics%20covered

Topics Covered

security advisory code execution Ubuntu information disclosure net-snmp attack vector regression

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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