Ubuntu DSA-4989-2 StrongSwan Urgent Patch: Vulnerability Alerts

CVE-2021-41990

RSASSA-PSS signatures whose parameters define a very high salt length can
trigger an integer overflow that can lead to a segmentation fault.
.
Generating a signature that bypasses the padding check to trigger the crash
requires access to the private key that signed the certificate. However,
the certificate does not have to be trusted. Because the gmp and the
openssl plugins both check if a parsed certificate is self-signed (and the
signature is valid), this can e.g. be triggered by an unrelated
self-signed CA certificate sent by an initiator.

CVE-2021-41991

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
...