bzip2 TOCTOU symlink

bzip2-toctou-symlink (19926)

Medium Risk

Description:

bzip2 could allow a local attacker to launch a symlink attack. If the local attacker has write access to the directory of a user using bzip2, the local attacker could exploit a TOCTOU vulnerability using a symlink to change file permissions of arbitrary files.

*CVSS:

Base Score:	2.6
Access Vector:	Local
Access Complexity:	High
Authentication:	Not Required
Confidentiality Impact:	None
Integrity Impact:	Partial
Availability Impact:	Partial
Temporal Score:	2.3
Exploitability:	High
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

File Manipulation

Remedy:

Upgrade to the latest version of bzip2 (1.0.3 or later), available from the bzip2 Web page. See References.

For other distributions:
Apply the appropriate update for your system. See References..

References:

• Apple Web site: About the security content of Mac OS X 10.4.11 and Security Update 2007-008.
• BugTraq Mailing List, Wed Mar 30 2005 - 15:38:55 CST : bzip2 TOCTOU file-permissions vulnerability.
• bzip2 Web site: The bzip2 and libbzip2 official home page.
• Conectiva Linux Security Announcement CLSA-2005:972: bzip2 security fixes.
• FreeBSD Security Advisory FreeBSD-SA-05:14.bzip2: bzip2 denial of service and permission race vulnerabilities.
• Sun Alert ID: 103118: Two Security Vulnerabilities in the bzip2(1) Command may Allow the Permissions of Arbitrary Files to be Modified or Allow for Arbitrarily Large Files to be Created.
• ASA-2007-451: Two Security Vulnerabilities in the bzip2(1) Command may Allow the Permissions of Arbitrary Files to be Modified or Allow for Arbitrarily Large Files to be Created (Sun 103118)
• BID-12954: bzip2 chmod File Permission Modification Race Condition Weakness
• BID-26444: Apple Mac OS X v10.4.11 2007-008 Multiple Security Vulnerabilities
• CVE-2005-0953: Race condition in bzip2 1.0.2 and earlier allows local users to modify permissions of arbitrary files via a hard link attack on a file while it is being decompressed, whose permissions are changed by bzip2 after the decompression is complete.
• DSA-730: bzip2 -- race condition
• MDKSA-2005:091: Updated bzip2 packages fix multiple vulnerabilities
• MDKSA-2006:026: Updated bzip2 packages fix bzgrep vulnerabilities
• OpenPKG-SA-2005.008: bzip2
• OpenPKG-SA-2005.010: OpenPKG
• OpenPKG-SA-2007.002: bzip2
• RHSA-2005-474: bzip2 security update
• SA27274: Sun Solaris bzip2 Multiple Vulnerabilities
• SA27643: Apple Mac OS X Security Update Fixes Multiple Vulnerabilities

Platforms Affected:

• Apple Mac OS X 10.4
• Apple Mac OS X 10.4.1
• Apple Mac OS X 10.4.10
• Apple Mac OS X 10.4.2
• Apple Mac OS X 10.4.3
• Apple Mac OS X 10.4.4
• Apple Mac OS X 10.4.5
• Apple Mac OS X 10.4.6
• Apple Mac OS X 10.4.7
• Apple Mac OS X 10.4.8
• Apple Mac OS X 10.4.9
• Apple Mac OS X Server 10.4
• Apple Mac OS X Server 10.4.1
• Apple Mac OS X Server 10.4.10
• Apple Mac OS X Server 10.4.2
• Apple Mac OS X Server 10.4.3
• Apple Mac OS X Server 10.4.4
• Apple Mac OS X Server 10.4.5
• Apple Mac OS X Server 10.4.6
• Apple Mac OS X Server 10.4.7
• Apple Mac OS X Server 10.4.8
• Apple Mac OS X Server 10.4.9
• Canonical Ubuntu 4.10
• Canonical Ubuntu 5.04
• Conectiva Linux 10
• Conectiva Linux 9.0
• Debian Debian Linux 3.0
• Julian Seward bzip2 1.0.2 and prior
• MandrakeSoft Mandrake Linux 10.0 AMD64
• MandrakeSoft Mandrake Linux 10.0
• MandrakeSoft Mandrake Linux 10.1
• MandrakeSoft Mandrake Linux 10.1 X86_64
• MandrakeSoft Mandrake Linux 2006
• MandrakeSoft Mandrake Linux 2006 X86_64
• MandrakeSoft Mandrake Linux LE2005
• MandrakeSoft Mandrake Linux LE2005 X86_64
• MandrakeSoft Mandrake Linux Corporate Server 2.1 X86_64
• MandrakeSoft Mandrake Linux Corporate Server 2.1
• MandrakeSoft Mandrake Linux Corporate Server 3.0
• MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
• MandrakeSoft Mandrake Multi Network Firewall 2.0
• OpenPKG OpenPKG 2-STABLE
• OpenPKG OpenPKG 2.1
• OpenPKG OpenPKG 2.2
• OpenPKG OpenPKG 2.3
• OpenPKG OpenPKG CURRENT
• OpenPKG OpenPKG Enterprise E1.0-SOLID
• RedHat Enterprise Linux 2.1 AS
• RedHat Enterprise Linux 2.1 ES
• RedHat Enterprise Linux 2.1 WS
• RedHat Enterprise Linux 3 WS
• RedHat Enterprise Linux 3 AS
• RedHat Enterprise Linux 3 ES
• RedHat Enterprise Linux 3 Desktop
• RedHat Enterprise Linux 4 WS
• RedHat Enterprise Linux 4 ES
• RedHat Enterprise Linux 4 AS
• RedHat Enterprise Linux 4 Desktop
• RedHat Linux Advanced Workstation 2.1 Itanium
• Sun Solaris 10 x86
• Sun Solaris 10 SPARC
• Sun Solaris 8 SPARC
• Sun Solaris 8 x86
• Sun Solaris 9 SPARC
• Sun Solaris 9 x86
• Turbolinux Turbolinux 10 Desktop
• Turbolinux Turbolinux 10 F...
• Turbolinux Turbolinux 10 Server
• Turbolinux Turbolinux 7 Server
• Turbolinux Turbolinux 7 Workstation
• Turbolinux Turbolinux 8 Server
• Turbolinux Turbolinux 8 Workstation
• Turbolinux Turbolinux Home
• Turbolinux Turbolinux Appliance Server 1.0 Hosting Ed
• Turbolinux Turbolinux Appliance Server 1.0 Workgroup Ed

Reported:

Mar 30, 2005

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