Bug 649713 (CVE-2010-3875)

Summary:	CVE-2010-3875 kernel: net/ax25/af_ax25.c: reading uninitialized stack memory
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	Keywords:	Security
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Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2021-10-19 09:15:34 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2010-11-04 12:01:54 UTC

Description of problem:
Sometimes ax25_getname() doesn't initialize all members of fsa_digipeater field of fsa struct.  This structure is then copied to userland.  It leads to leaking of contents of kernel stack memory.  We have to initialize them to zero.

Reference:
http://marc.info/?l=linux-netdev&m=128854507120898&w=2
http://seclists.org/oss-sec/2010/q4/94

Acknowledgements:

Red Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.

Comment 1 Petr Matousek 2010-11-04 18:46:29 UTC

Statement:

This issue did not affect the version of Linux kernel as shipped with Red Hat
Enterprise Linux 4, 5, and Red Hat Enterprise MRG as they did not include
support for Amateur Radio AX.25 protocol.

This issue is not planned to be fixed in Red Hat Enterprise Linux 3, due to
this product being in Extended Life Cycle Phase of its maintenance life-cycle,
where only qualified security errata of critical impact are addressed.

For further information about the Errata Support Policy, visit:
http://www.redhat.com/security/updates/errata

Comment 2 Eugene Teo (Security Response) 2010-11-22 13:22:42 UTC

Upstream commit:
http://git.kernel.org/linus/fe10ae53384e48c51996941b7720ee16995cbcb7