USN-4471-2: Net-SNMP regression

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• 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

• 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

• 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

• 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://launchpad.net/bugs/1892980