Samba ACL security bypass

samba-acl-security-bypass (51327) The risk level is classified as MediumMedium Risk

Description:

Samba could allow a remote attacker to bypass security restrictions, caused by an uninitialized memory access error within the smbd daemon when attempts to modify a restricted access control list (ACL) are denied. If the server is configured with the "dos filemode" parameter set to "yes" in the smb.conf file, a remote attacker with write access to the file could exploit this vulnerability to modify the ACL of a writable file.

*CVSS:

Base Score: 4
  Access Vector: Network
  Access Complexity: Low
  Authentication: Single
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 3
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Upgrade to the latest version of Samba (3.2.13, 3.0.35 or 3.3.6 or later), available from the Samba Web site. See References.

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

References:

  • Samba Web site: CVE-2009-1888: Uninitialized read of a data value.
  • Sun Alert ID: 267628: Security Vulnerability in Samba (SAMBA(7)) May Allow Unauthorized Changes to Access Control Lists (ACL).
  • VMSA-2010-0006: ESX Service Console updates for samba and acpid.
  • BID-35472: Samba Format String And Security Bypass Vulnerabilities
  • CVE-2009-1888: The acl_group_override function in smbd/posix_acls.c in smbd in Samba 3.0.x before 3.0.35, 3.1.x and 3.2.x before 3.2.13, and 3.3.x before 3.3.6, when dos filemode is enabled, allows remote attackers to modify access control lists for files via vectors related to read access to uninitialized memory.
  • DSA-1823: samba -- several vulnerabilities
  • MDVSA-2009:196: samba
  • MDVSA-2009:320: samba
  • OSVDB ID: 55411: Samba smbd/posix_acls.c acl_group_override Function Remote Access Control List Modification
  • RHSA-2009-1529: Moderate: samba security update
  • RHSA-2009-1585: Moderate: samba3x security and bug fix update
  • SA35539: Samba Security Bypass and Format String Vulnerabilities
  • SA36884: Sun Solaris Samba ACL Security Bypass
  • SA36887: Sun Solaris 10 Samba ACL Security Bypass
  • SA39147: VMware ESX Server 4 Update for samba and acpid
  • SA39162: VMware vMA Samba and acpid Multiple Vulnerabilities
  • SA39218: VMware ESX Server Samba Multiple Vulnerabilities
  • SECTRACK ID: 1022442: Samba smbd Access Control Bug Lets Remote Authenticated Users Bypass Certain Access Controls
  • SUSE-SA:2009:037: dhcp-client security problem
  • USN-839-1: Samba vulnerabilities
  • VUPEN/ADV-2009-1664: Samba smbclient Format String and smbd Security Bypass Vulnerabilities

Platforms Affected:

  • Canonical Ubuntu 6.06 LTS
  • Canonical Ubuntu 8.04 LTS
  • Canonical Ubuntu 8.10
  • Debian Debian Linux 5.0
  • MandrakeSoft Mandrake Linux 2008.0
  • MandrakeSoft Mandrake Linux 2008.0 X86_64
  • Mandriva Enterprise Server 5
  • Mandriva Enterprise Server 5 X86_64
  • Mandriva Linux 2009.0 X86_64
  • Mandriva Linux 2009.0
  • Novell Linux Desktop 9
  • Novell Linux POS 9
  • Novell Open Enterprise Server
  • Novell OpenSUSE 10.3
  • Novell OpenSUSE 11.0
  • Novell SLE SDK 10 SP2
  • Novell SUSE Linux Enterprise 10 SP2 DEBUGINFO
  • Novell SUSE Linux Enterprise Desktop 10 SP2
  • Novell SUSE Linux Enterprise Server 10 SP2
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4.8.z ES
  • RedHat Enterprise Linux 4.8.z AS
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5.4.z EUS
  • RedHat RHEL Desktop Supplementary 5 Client
  • RedHat RHEL Supplementary 5 Server
  • RedHat RHEL Supplementary 5.4.z EUS
  • Samba Samba 3.0.31
  • Samba Samba 3.0.32
  • Samba Samba 3.0.33
  • Samba Samba 3.0.34
  • Samba Samba 3.2.0
  • Samba Samba 3.2.1
  • Samba Samba 3.2.12
  • Samba Samba 3.2.2
  • Samba Samba 3.2.3
  • Samba Samba 3.2.4
  • Samba Samba 3.2.5
  • Samba Samba 3.2.6
  • Samba Samba 3.3.5
  • Sun OpenSolaris build_snv_110 SPARC
  • Sun OpenSolaris build_snv_110 x86
  • Sun OpenSolaris build_snv_111 x86
  • Sun OpenSolaris build_snv_111 SPARC
  • Sun OpenSolaris build_snv_112 x86
  • Sun OpenSolaris build_snv_112 SPARC
  • Sun OpenSolaris build_snv_113 x86
  • Sun OpenSolaris build_snv_113 SPARC
  • Sun OpenSolaris build_snv_114 x86
  • Sun OpenSolaris build_snv_114 SPARC
  • Sun OpenSolaris build_snv_115 SPARC
  • Sun OpenSolaris build_snv_115 x86
  • Sun OpenSolaris build_snv_116 SPARC
  • Sun OpenSolaris build_snv_116 x86
  • Sun OpenSolaris build_snv_117 SPARC
  • Sun OpenSolaris build_snv_117 x86
  • Sun OpenSolaris build_snv_118 SPARC
  • Sun OpenSolaris build_snv_118 x86
  • Sun OpenSolaris build_snv_96 SPARC
  • Sun OpenSolaris build_snv_96 x86
  • Sun OpenSolaris build_snv_97 x86
  • Sun OpenSolaris build_snv_97 SPARC
  • Sun OpenSolaris build_snv_98 x86
  • Sun OpenSolaris build_snv_98 SPARC
  • Sun OpenSolaris build_snv_99 SPARC
  • Sun OpenSolaris build_snv_99 x86
  • Sun Solaris 10 SPARC
  • Sun Solaris 10 x86
  • Sun Solaris 9 SPARC
  • Sun Solaris 9 x86
  • SuSE SuSE SLES 9
  • VMware vMA 4.0

Reported:

Jun 23, 2009

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