Bug 709284 (CVE-2011-1947)

Summary:	CVE-2011-1947 fetchmail: Application hang due unguarded blocking I/O in IMAP/POP3 STARTTLS initialization (fetchmail-SA-2011-01)
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	pertusus, vcrhonek, vdanen
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	fetchmail 6.3.20	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-08-22 06:47:15 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	709287
Bug Blocks:

Description Jan Lieskovsky 2011-05-31 09:50:47 UTC

It was found that fetchmail, a remote mail retrieval and forwarding utility,
did not guard STARTTLS-initiated SSL/TLS negotiation in IMAP and POP3 sessions
with a timeout. A malicious man-in-the-middle remote server could delay
acknowledging of fetchmail's STARTTLS or STLS requests, leading to denial
of fetchmail's mail-retrieval and mail-forwarding services.

References:
[1] http://gitorious.org/fetchmail/fetchmail/blobs/legacy_63/fetchmail-SA-2011-01.txt
    (upstream advisory)
[2] http://www.openwall.com/lists/oss-security/2011/05/30/1
    (CVE request)

Upstream changeset:
[3] http://gitorious.org/fetchmail/fetchmail/commit/7dc67b8cf06f74aa57525279940e180c99701314

Comment 1 Jan Lieskovsky 2011-05-31 09:53:04 UTC

This issue affects the versions of the fetchmail package, as shipped with
Red Hat Enterprise Linux 4, 5, and 6.

--

This issue affects the versions of the fetchmail package, as shipped with
Fedora release of 13, 14, and 15. Please schedule an update with above
upstream patch.

Comment 2 Jan Lieskovsky 2011-05-31 09:53:58 UTC

Created fetchmail tracking bugs for this issue

Affects: fedora-all [bug 709287]

Comment 3 Jan Lieskovsky 2011-06-01 16:05:02 UTC

The CVE identifier of CVE-2011-1947 has been assigned to this issue.

Comment 5 Jan Lieskovsky 2011-06-06 15:34:55 UTC

It was reported, that to properly address this issue, it will need more
invasive patches, than just backport the security fix:
[4] http://www.openwall.com/lists/oss-security/2011/06/06/5

Comment 6 Vincent Danen 2011-06-17 18:18:41 UTC

This is corrected upstream in version 6.3.20:

https://gitorious.org/fetchmail/fetchmail/blobs/legacy_63/NEWS

Comment 7 Vincent Danen 2015-08-22 06:47:04 UTC

Statement:

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.