USN-5111-1: strongSwan vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• strongswan - IPsec VPN solution

Details

It was discovered that strongSwan incorrectly handled certain RSASSA-PSS
signatures. A remote attacker could use this issue to cause strongSwan to
crash, resulting in a denial of service. (CVE-2021-41990)

It was discovered that strongSwan incorrectly handled replacing
certificates in the cache. A remote attacker could use this issue to cause
strongSwan to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-41991)

Update instructions

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

Ubuntu 21.10

• libstrongswan - 5.9.1-1ubuntu3.1
• strongswan - 5.9.1-1ubuntu3.1

Ubuntu 21.04

• libstrongswan - 5.9.1-1ubuntu1.2
• strongswan - 5.9.1-1ubuntu1.2

Ubuntu 20.04

• libstrongswan - 5.8.2-1ubuntu3.3
• strongswan - 5.8.2-1ubuntu3.3

Ubuntu 18.04

• libstrongswan - 5.6.2-1ubuntu2.7
• strongswan - 5.6.2-1ubuntu2.7

In general, a standard system update will make all the necessary changes.

References

• CVE-2021-41991
• CVE-2021-41990

Related notices

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