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AUSCERT External Security Bulletin Redistribution
USN-4972-1: PostgreSQL vulnerabilities
2 June 2021
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Increased Privileges -- Existing Account
Overwrite Arbitrary Files -- Existing Account
Access Confidential Data -- Existing Account
CVE Names: CVE-2021-32029 CVE-2021-32028 CVE-2021-32027
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USN-4972-1: PostgreSQL vulnerabilities
01 June 2021
Several security issues were fixed in PostgreSQL.
o Ubuntu 21.04
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o postgresql-10 - Object-relational SQL database
o postgresql-12 - Object-relational SQL database
o postgresql-13 - Object-relational SQL database
Tom Lane discovered that PostgreSQL incorrect handled certain array
subscripting calculations. An authenticated attacker could possibly use
this issue to overwrite server memory and escalate privileges.
( CVE-2021-32027 )
Andres Freund discovered that PostgreSQL incorrect handled certain
INSERT ... ON CONFLICT ... DO UPDATE commands. A remote attacker could
possibly use this issue to read server memory and obtain sensitive
information. ( CVE-2021-32028 )
Tom Lane discovered that PostgreSQL incorrect handled certain UPDATE ...
RETURNING commands. A remote attacker could possibly use this issue to read
server memory and obtain sensitive information. This issue only affected
Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. ( CVE-2021-32029 )
The problem can be corrected by updating your system to the following package
o postgresql-13 - 13.3-0ubuntu0.21.04.1
o postgresql-12 - 12.7-0ubuntu0.20.10.1
o postgresql-12 - 12.7-0ubuntu0.20.04.1
o postgresql-10 - 10.17-0ubuntu0.18.04.1
This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart PostgreSQL to
make all the necessary changes.
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