CUPS SNMP asn1_get_string() buffer overflow

cups-asn1getstring-bo (39101) The risk level is classified as HighHigh Risk

Description:

CUPS (Common UNIX Printing System) is vulnerable to a stack-based buffer overflow, caused by an integer signedness error in the asn1_get_string function. By sending a specially-crafted SNMP reply containing negative length values in an asn1 encoded string, a remote attacker could overflow a buffer and execute arbitrary code on the system with elevated privileges or cause the service to crash.

*CVSS:

Base Score: 7.5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 5.9
  Exploitability: Proof-of-Concept
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Upgrade to the latest version of CUPS (1.3.5 or later), available from the CUPS Web site. See References.

For Apple Mac OS X:
Apply Apple Security Update 2007-009 v1.1, available from the Apple Web site. See References.

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

References:

  • Apple Web site: About Security Update 2007-009.
  • Apple Web site: About Security Update 2007-009 v1.1.
  • CUPS STR #2589: SNMP backend integer underflow/stack overflow in asn1_get_string().
  • CUPS Web site: Download - Common UNIX Printing System.
  • BID-26910: Apple Mac OS X v10.5.1 2007-009 Multiple Security Vulnerabilities
  • BID-26917: Common UNIX Printing System SNMP 'asn1_get_string()' Remote Buffer Overflow Vulnerability
  • CVE-2007-5849: Integer underflow in the asn1_get_string function in the SNMP back end (backend/snmp.c) for CUPS 1.2 through 1.3.4 allows remote attackers to execute arbitrary code via a crafted SNMP response that triggers a stack-based buffer overflow.
  • DSA-1437: cupsys -- several vulnerabilities
  • GLSA-200712-14: CUPS: Multiple vulnerabilities
  • MDVSA-2008:036: Updated CUPS packages fix SNMP vulnerability
  • SA28129: CUPS SNMP Backend "asn1_get_string()" Signedness Vulnerability
  • SA28136: Apple Mac OS X Security Update Fixes Multiple Vulnerabilities
  • SUSE-SA:2008:002: SUSE Security Announcement
  • SUSE-SR:2008:002: SUSE Security Summary Report
  • USN-563-1: CUPS vulnerabilities
  • VUPEN/ADV-2007-4238: Apple Mac OS X Code Execution and Information Disclosure Vulnerabilities
  • VUPEN/ADV-2007-4242: CUPS SNMP Backend asn1_get_string() Integer Underflow Vulnerability

Platforms Affected:

  • Apple CUPS 1.3.4 and prior
  • Apple Mac OS X 10.5.1
  • Apple Mac OS X Server 10.5.1
  • Canonical Ubuntu 6.06 LTS
  • Canonical Ubuntu 6.10
  • Canonical Ubuntu 7.04
  • Canonical Ubuntu 7.10
  • Debian Debian Linux 4.0
  • Gentoo Linux
  • MandrakeSoft Mandrake Linux 2007 X86_64
  • MandrakeSoft Mandrake Linux 2007
  • MandrakeSoft Mandrake Linux 2007.1 X86_64
  • MandrakeSoft Mandrake Linux 2007.1
  • MandrakeSoft Mandrake Linux 2008.0 X86_64
  • MandrakeSoft Mandrake Linux 2008.0
  • MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • Novell Linux Desktop 9
  • Novell Linux POS 9
  • Novell Open Enterprise Server
  • Novell Open Enterprise Server
  • Novell OpenSUSE 10.2
  • Novell OpenSUSE 10.3
  • Novell SUSE Linux Enterprise Desktop 10 SP1
  • Novell SUSE Linux Enterprise Server 10
  • Novell SUSE Linux Enterprise Server 10 SP1
  • SuSE SuSE SLES 9

Reported:

Dec 17, 2007

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