Debian Stretch DLA-2788-1: StrongSwan Moderate Denial Of Service

debian lts

October 19, 2021

Researchers at the United States of America National Security Agency (NSA) identified a denial of services vulnerability in strongSwan, an IKE/IPsec suite

Topics Covered

security advisory denial of service security issue debian integer overflow strongswan

Summary

Researchers at the United States of America National Security Agency (NSA)
identified a denial of services vulnerability in strongSwan, an
IKE/IPsec suite.

Once the in-memory certificate cache is full it tries to randomly replace
lesser used entries. Depending on the generated random value, this could
lead to an integer overflow that results in a double-dereference and a
call using out-of-bounds memory that most likely leads to a segmentation
fault.

Remote code execution can't be ruled out completely, but attackers have
no control over the dereferenced memory, so it seems unlikely at this
point.

For Debian 9 stretch, this problem has been fixed in version
5.5.1-4+deb9u5.

We recommend that you upgrade your strongswan packages.

For the detailed security status of strongswan please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/strongswan

Further information about Debian LTS security advisories, how to apply