DescriptionFormat string vulnerability in the log function in Net::Server 0.87 and earlier, as used in Postfix Greylisting Policy Server (Postgrey) 1.18 and earlier, and possibly other products, allows remote attackers to cause a denial of service (crash) via format string specifiers that are not properly handled before being sent to syslog, as demonstrated using sender addresses to Postgrey.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
ReferencesDSA-1121, DSA-1122
Debian Bugs378640

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libnet-server-perl (PTS)buster2.009-1fixed
bookworm, sid2.013-1fixed
postgrey (PTS)buster1.36-5.1fixed
bookworm, sid1.37-1.1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


Net::Server was already fixed in 0.87-1, although the changelog doesn't mention
the security implication, which was noticed later. I've verified both fixes
are identical
but DSA-1122 thinks it was fixed in 0.89-1, so mark that version to make
scripts happy (at time of writing, 0.90-1 is in testing)

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