Bug 1532768 – CVE-2017-15132 dovecot: Auth leaks memory if SASL authentication is aborted

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Bug 1532768 - (CVE-2017-15132) CVE-2017-15132 dovecot: Auth leaks memory if SASL authentication is aborted

Summary:	CVE-2017-15132 dovecot: Auth leaks memory if SASL authentication is aborted

Status:	NEW

Aliases:	CVE-2017-15132

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20180109,repor...
Keywords:	Reopened, Security

Depends On:	1532769 1551758 1551759 1538717
Blocks:	1538713
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Reported:	2018-01-09 13:54 EST by Pedro Sampaio
Modified:	2018-08-31 17:54 EDT (History)
CC List:	7 users (show)

See Also:
Fixed In Version:	dovecot 2.2.34, dovecot 2.3.1
Doc Type:	If docs needed, set a value
Doc Text:	Aborting the process of SASL authentication can lead to a memory leak when the same login processes are reused. An attacker could use this flaw to cause a denial of service due to memory exhaustion.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2018-02-19 15:23:34 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Description Pedro Sampaio 2018-01-09 13:54:56 EST

A flaw was found in dovecot 2.0 up to 2.2.33 and 2.3.0. A abort of SASL authentication results in a memory leak in Dovecot auth client used by login processes. The leak has impact in high performance configuration where same login processes are reused and can cause the process to crash due to memory exhaustion.

Upstream patch:

https://github.com/dovecot/core/commit/1a29ed2f96da1be22fa5a4d96c7583aa81b8b060.patch

https://github.com/dovecot/core/commit/a9b135760aea6d1790d447d351c56b78889dac22.patch

Comment 1 Pedro Sampaio 2018-01-09 13:55:02 EST

Acknowledgments:

Name: The Dovecot Project

Comment 3 Pedro Sampaio 2018-01-25 11:12:20 EST

Created dovecot tracking bugs for this issue:

Affects: fedora-all [bug 1538717]

Comment 4 Pedro Sampaio 2018-01-25 11:18:57 EST

Mitigation:

This issue can be mitigated on vulnerable systems by limiting the login process to a single request per process, which is also the default value.

Comment 6 Pedro Yóssis Silva Barbosa 2018-02-19 15:32:56 EST

A flaw was found in the original upstream fix, this additional fix is needed: 
https://github.com/dovecot/core/commit/a9b135760aea6d1790d447d351c56b78889dac22.patch see this post for details: http://seclists.org/oss-sec/2018/q1/119

Comment 9 Pedro Yóssis Silva Barbosa 2018-03-05 17:04:14 EST

External References:

https://www.dovecot.org/list/dovecot-news/2018-February/000370.html

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