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[OpenBSD] Schwachstelle in procfs Dateisystem
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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgende Warnung des OpenBSD Teams. Wir geben
diese Informationen unveraendert an Sie weiter.
Ein lokaler Angreifer kann eine unzureichende Ueberpruefung von
Speichergrenzen ausnuzten, um beliebige Speicherbereiche des Kernels
zu lesen. Potentiell kann ein Angreifer diese Schwachstelle ausnuzten,
um beliebige Befehle mit erweiterten Privilegien auszufuehren.
Allerdings ist laut OpenBSD das proc Dateisystem nicht per default
gemountet.
Betroffen sind die folgenden Software Pakete und Plattformen:
OpenBSD-stable
OpenBSD 3.5
OpenBSD 3.4
Vom Hersteller werden Patches zur Verfuegung gestellt.
(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,
Jan Kohlrausch, DFN-CERT
- --
Jan Kohlrausch (CSIRT), DFN-CERT Services GmbH
Web: https://www.dfn-cert.de/, Phone: +49-40-808077-555
PGP RSA/2048, A5DD03D1, A2 55 1C 51 0A 30 3E 78 5B 40 DA B7 14 F7 C9 E8
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UNIRAS (UK Govt CERT) Briefing Notice - 224/04 dated 14.05.04 Time: 11:20
UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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UNIRAS material is also available from its website at www.uniras.gov.uk and
Information about NISCC is available from www.niscc.gov.uk
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Title
=====
OpenBSD Security Advisory: procfs Vulnerability
Detail
======
Incorrect bounds checking in several procfs functions could allow an
unprivileged malicious user to read arbitrary kernel memory, with the
potential to use this information to escalate privilege.
ESB-2004.0342 -- OpenBSD Security Advisory
procfs Vulnerability
14 May 2004
===========================================================================
Product: procfs
Publisher: OpenBSD
Operating System: OpenBSD-stable
OpenBSD 3.5
OpenBSD 3.4
Impact: Access Privileged Data
Increased Privileges
Access Required: Existing Account
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Incorrect bounds checking in several procfs functions could allow an
unprivileged malicious user to read arbitrary kernel memory, with the
potential to use this information to escalate privilege. OpenBSD does not
mount the proc filesystem by default, and we continue to recommend against
its use.
The cvs -stable branches have been updated to contain a fix, which is also
available in patch form for 3.4 and 3.5.
Credit goes to Deprotect Advisories <advisories@xxxxxxxxxxxxx> for
identification of the bug.
Patches: ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.5/common/006_procfs.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.4/common/020_procfs.patch
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For additional information or assistance, please contact the HELP Desk by
telephone or Not Protectively Marked information may be sent via
EMail to: uniras@xxxxxxxxxxxx
Office Hours:
Mon - Fri: 08:30 - 17:00 Hrs
Tel: +44 (0) 20 7821 1330 Ext 4511
Fax: +44 (0) 20 7821 1686
Outside of Office Hours:
On Call Duty Officer:
Tel: +44 (0) 20 7821 1330 and follow the prompts
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UNIRAS wishes to acknowledge the contributions of OpenBSD for the information
contained in this Briefing.
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This Briefing contains the information released by the original author. Some
of the information may have changed since it was released. If the vulnerability
affects you, it may be prudent to retrieve the advisory from the canonical site
to ensure that you receive the most current information concerning that problem.
Reference to any specific commercial product, process, or service by trade
name, trademark manufacturer, or otherwise, does not constitute or imply
its endorsement, recommendation, or favouring by UNIRAS or NISCC. The views
and opinions of authors expressed within this notice shall not be used for
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not be liable for any loss or damage whatsoever, arising from or in connection
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and has contacts with other international Incident Response Teams (IRTs) in
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members and the community at large.
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<End of UNIRAS Briefing>
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