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AUSCERT External Security Bulletin Redistribution
ESB-2020.2891.2
USN-4471-2: Net-SNMP vulnerabilities
2 September 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Net-SNMP
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-15862 CVE-2020-15861
Reference: ESB-2020.2818
ESB-2020.2668
Original Bulletin:
https://usn.ubuntu.com/4471-2/
Revision History: September 2 2020: Added cacheTime feature flag to update
August 25 2020: Initial Release
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USN-4471-2: Net-SNMP regression
01 September 2020
USN-4471-1 introduced a regression in Net-SNMP.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Packages
o 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
o libsnmp-base - 5.7.3+dfsg-1.8ubuntu3.6
o libsnmp-perl - 5.7.3+dfsg-1.8ubuntu3.6
o libsnmp30 - 5.7.3+dfsg-1.8ubuntu3.6
o snmpd - 5.7.3+dfsg-1.8ubuntu3.6
Ubuntu 16.04
o libsnmp-base - 5.7.3+dfsg-1ubuntu4.6
o libsnmp-perl - 5.7.3+dfsg-1ubuntu4.6
o libsnmp30 - 5.7.3+dfsg-1ubuntu4.6
o snmpd - 5.7.3+dfsg-1ubuntu4.6
Ubuntu 14.04
o libsnmp-base - 5.7.2~dfsg-8.1ubuntu3.3+esm2
o libsnmp-perl - 5.7.2~dfsg-8.1ubuntu3.3+esm2
o libsnmp30 - 5.7.2~dfsg-8.1ubuntu3.3+esm2
o 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
o https://launchpad.net/bugs/1892980
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