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Bug 1406286 - (CVE-2016-10011) CVE-2016-10011 openssh: Leak of host private key material to privilege-separated child process via realloc()
CVE-2016-10011 openssh: Leak of host private key material to privilege-separa...
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20161219,reported=2...
: Security
Depends On: 1406296
Blocks: 1406299 1415638
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Reported: 2016-12-20 03:25 EST by Andrej Nemec
Modified: 2017-11-01 20:19 EDT (History)
8 users (show)

See Also:
Fixed In Version: openssh 7.4
Doc Type: If docs needed, set a value
Doc Text:
It was found that the host private key material could possibly leak to the privilege-separated child processes via re-allocated memory. An attacker able to compromise the privilege-separated process could therefore obtain the leaked key information.
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Clone Of:
Environment:
Last Closed: 2017-01-16 01:11:30 EST
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2029 normal SHIPPED_LIVE Moderate: openssh security, bug fix, and enhancement update 2017-08-01 14:11:55 EDT

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Description Andrej Nemec 2016-12-20 03:25:06 EST 
It was found that there is a theoretical leak of host private key material to privilege-separated child processes via realloc() when reading keys. No such leak was observed in practice for normal-sized keys, nor does a leak to the child processes directly expose key material to unprivileged users.

CVE assignment:

http://seclists.org/oss-sec/2016/q4/708

External References:

https://www.openssh.com/txt/release-7.4
Comment 2 Andrej Nemec 2016-12-20 03:41:29 EST 
Created openssh tracking bugs for this issue:

Affects: fedora-all [bug 1406296]
Comment 3 Huzaifa S. Sidhpurwala 2017-01-16 01:11:30 EST 
Statement:

It seems that this flaw is not practically exploitable, the leak of host private key material to the privilege-separated child processes is theoretical. No such leak was observed in practice for normal-sized keys, nor does a leak to the child processes directly expose key material to unprivileged users. Because of the this restriction for successful exploitation, this issue has been rated as having Low security impact. A future update may address this flaw.
Comment 4 errata-xmlrpc 2017-08-01 14:45:35 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2029 https://access.redhat.com/errata/RHSA-2017:2029
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