Bug 1809295 (CVE-2020-9273)

Summary:	CVE-2020-9273 proftpd: use-after-free in alloc_pool in pool.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	MODIFIED ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	ingvar, itamar, matthias, paul
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Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	proftpd-1.3.6c-1.fc31 proftpd-1.3.6c-1.fc30 proftpd-1.3.6c-1.el8	Doc Type:	If docs needed, set a value
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Guilherme de Almeida Suckevicz 2020-03-02 19:19:47 UTC

In ProFTPD 1.3.7, it is possible to corrupt the memory pool by interrupting the data transfer channel. This triggers a use-after-free in alloc_pool in pool.c, and possible remote code execution.

Reference:
https://github.com/proftpd/proftpd/issues/903

Comment 1 Paul Howarth 2020-03-03 08:37:06 UTC

This is fixed in proftpd 1.3.6c:

F-31: https://bodhi.fedoraproject.org/updates/FEDORA-2020-876b1f664e
F-30: https://bodhi.fedoraproject.org/updates/FEDORA-2020-76c707cff0
EPEL-8: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2020-3483348dc1

The fix was backported to proftpd 1.3.5e for EPEL-7:
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2020-ea579d7782

The fix was backported to proftpdd 1.3.3g for EPEL-6:
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2020-91512b5eee