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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgendes Sun Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.

Sun Bug ID 6345171 – Schwachstelle in den Funktionen sendfile(3EXT)
und sendfilev(3EXT)

In den Solaris Bibliotheksfunktionen sendfile(3EXT) und
sendfilev(3EXT) befindet sich eine nicht naeher beschriebene
Schwachstelle, durch die ein lokaler Angreifer eine Kernel Panic
ausloesen kann (Denial of Service).

Die Existenz der Schwachstelle koennen Sie wie folgt erkennen:

Wird die Schwachstelle ausgenutzt, zeigt sich ein Stack Trace aehnlich
dem Folgenden:

panic[cpu1]/thread=c8491660: Deadlock: cycle in blocking chain
c9091cf4 genunix:turnstile_block() c9091d3c unix:rw_enter_sleep()
c9091d5c tmpfs:tmp_rwlock() c9091d70 genunix:fop_rwlock() c9091e18
genunix:sendvec_chunk() c9091f7c genunix:sendfilev()

Betroffen sind die folgenden Software Pakete und Plattformen:

SPARC Plattform
* Solaris 8 ohne Patch 127721-02
* Solaris 9 ohne Patch 122300-42
* Solaris 10 ohne Patch 141414-05
* OpenSolaris basierend auf den Builds snv_01 bis snv_109

x86 Plattform
* Solaris 8 ohne Patch 127722-02
* Solaris 9 ohne Patch 122301-42
* Solaris 10 ohne Patch 141415-05
* OpenSolaris basierend auf den Builds snv_01 bis snv_109

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

Hersteller Advisory:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-258588-1

(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.

Mit freundlichen Gruessen,
Klaus Moeller, DFN-CERT

– —
Dipl. Inform. Klaus Moeller (Incident Response Team)
Phone: +49 40 808077-555, Fax: +49 40 808077-556

DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrase 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski

Solution Type Sun Alert
Solution 258588 : Security Vulnerability in the Solaris
sendfile(3EXT) and sendfilev(3EXT) Extended Library Functions may
Result in a Denial of Service (DoS) Condition due to a System Panic
Related Categories

* Home>Content>Sun Alert Criteria Categories>Security
* Home>Content>Sun Alert Release Phase>Resolved

Bug ID
6345171

Product
Solaris 8
Solaris 9
Solaris 10
OpenSolaris

Date of Resolved Release
18-Aug-2009

SA Document Body
Security vulnerability in the Solaris sendfile(3EXT) and sendfilev(3EXT) extend
ed library functions may result in a Denial of Service (DoS) condition due to a
system panic:

1. Impact
A security vulnerability in the Solaris sendfile(3EXT) and
sendfilev(3EXT) extended library functions may allow a local
unprivileged user to panic the system, causing a Denial of Service
(DoS).
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 8 without patch 127721-02
* Solaris 9 without patch 122300-42
* Solaris 10 without patch 141414-05
* OpenSolaris based upon builds snv_01 through snv_109

x86 Platform
* Solaris 8 without patch 127722-02
* Solaris 9 without patch 122301-42
* Solaris 10 without patch 141415-05
* OpenSolaris based upon builds snv_01 through snv_109

Note: OpenSolaris distributions may include additional bug fixes above
and beyond the build from which it was derived. To determine the base
build of OpenSolaris, the following command can be used:
$ uname -v
snv_86

Note 2: Solaris 8 entered EOSL Phase 2 on 1 April 2009. Entitlement to
patches developed on or after 1 April 2009 requires the purchase of the
Solaris 8 Vintage Patch Service. See note in section 5 for more
details.
3. Symptoms
If the described issue occurs, the system may panic with a stack trace
similar to the following:
panic[cpu1]/thread=c8491660: Deadlock: cycle in blocking chain
c9091cf4 genunix:turnstile_block()
c9091d3c unix:rw_enter_sleep()
c9091d5c tmpfs:tmp_rwlock()
c9091d70 genunix:fop_rwlock()
c9091e18 genunix:sendvec_chunk()
c9091f7c genunix:sendfilev()

4. Workaround
There is no workaround for this issue. Please see the Resolution
section below.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 8 with patch 127721-02 or later
* Solaris 9 with patch 122300-42 or later
* Solaris 10 with patch 141414-05
* OpenSolaris based upon builds snv_110 or later

x86 Platform
* Solaris 8 with patch 127722-02 or later
* Solaris 9 with patch 122301-42 or later
* Solaris 10 with patch 141415-05 or later
* OpenSolaris based upon builds snv_110 or later

Note: The READMEs of Solaris 8 patches developed on or after 1 April
2009 are available to all customers however Solaris 8 entered EOSL
Phase 2 on April 1, 2009 and thus entitlement for these patches,
including those that fix security vulnerabilities, requires the
purchase of the Solaris 8 Vintage Patch Service. More information about
the Solaris 8 Vintage Patch Service is available at:
* http://www.sun.com/service/eosl/Solaris8.html

For more information on Security Sun Alerts, see Technical Instruction
ID 213557.
This Sun Alert notification is being provided to you on an “AS IS”
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
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AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
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INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT
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Sun Alert notification contains Sun proprietary and confidential
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Clara, CA 95054 U.S.A. All rights reserved.
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