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USN-4730-1: PostSRSd vulnerability

10 February 2021

PostSRSd could be made to crash if it received specially crafted input.



  • postsrsd - Sender Rewriting Scheme via TCP-based lookup tables for Postfix


It was discovered that PostSRSd mishandled certain input. A remote attacker
could use this vulnerability to cause a denial of service via a long timestamp
tag in an SRS address.

Update instructions

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

Ubuntu 18.04

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