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AUSCERT External Security Bulletin Redistribution
ESB-2021.0502
USN-4730-1: PostSRSd vulnerability
11 February 2021
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AusCERT Security Bulletin Summary
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Product: PostSRSd
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-35573
Reference: ESB-2020.4508
Original Bulletin:
https://ubuntu.com/security/notices/USN-4730-1
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SN-4730-1: PostSRSd vulnerability
10 February 2021
PostSRSd could be made to crash if it received specially crafted
input.
Releases
o Ubuntu 18.04 LTS
Packages
o postsrsd - Sender Rewriting Scheme via TCP-based lookup tables for Postfix
Details
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
o postsrsd - 1.4-1ubuntu0.1
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-35573
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