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
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-15132
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1532769 1538717 1551758 1551759
Blocks: 1538713
TreeView+ depends on / blocked
 
Reported: 2018-01-09 18:54 UTC by Pedro Sampaio
Modified: 2021-10-21 19:52 UTC (History)
6 users (show)

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.
Clone Of:
Environment:
Last Closed: 2021-10-21 19:52:47 UTC
Embargoed:

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Description Pedro Sampaio 2018-01-09 18:54:56 UTC 
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 18:55:02 UTC 
Acknowledgments:

Name: the Dovecot project
Comment 3 Pedro Sampaio 2018-01-25 16:12:20 UTC 
Created dovecot tracking bugs for this issue:

Affects: fedora-all [bug 1538717]
Comment 4 Pedro Sampaio 2018-01-25 16:18:57 UTC 
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 20:32:56 UTC 
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 22:04:14 UTC 
External References:

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