CVE-2020-9274

NameCVE-2020-9274
DescriptionAn issue was discovered in Pure-FTPd 1.0.49. An uninitialized pointer vulnerability has been detected in the diraliases linked list. When the *lookup_alias(const char alias) or print_aliases(void) function is called, they fail to correctly detect the end of the linked list and try to access a non-existent list member. This is related to init_aliases in diraliases.c.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2123-1
NVD severitymedium
Debian Bugs952666

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
pure-ftpd (PTS)stretch1.0.43-3vulnerable
buster1.0.47-3vulnerable
bookworm, sid, bullseye1.0.49-4.1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
pure-ftpdsourcejessie1.0.36-3.2+deb8u1DLA-2123-1
pure-ftpdsource(unstable)1.0.49-4952666

Notes

[buster] - pure-ftpd <no-dsa> (Minor issue)
[stretch] - pure-ftpd <no-dsa> (Minor issue)
https://github.com/jedisct1/pure-ftpd/commit/8d0d42542e2cb7a56d645fbe4d0ef436e38bcefa
though the CVE description does not specifically say, the issue seems to be an
out-of-bounds memory read which may result in information disclosure;
probably not the end of the world, but it is made worse by use of the rather
unsafe strcmp() instead of strncmp() in the vulnerable functions

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