Vulnerability Name:

CVE-2007-3731 (CCN-36681)

Assigned:2007-07-15
Published:2007-07-15
Updated:2023-02-13
Summary:The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in %cs (the xcs field) during ptrace single-step operations, which allows local users to cause a denial of service (NULL dereference and OOPS) via certain code that makes ptrace PTRACE_SETREGS and PTRACE_SINGLESTEP requests, related to the TRACE_IRQS_ON function, and possibly related to the arch_ptrace function.
CVSS v3 Severity:4.0 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C)
3.9 Low (Temporal CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:UR)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
2.1 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)
1.7 Low (CCN Temporal CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:UR)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-476
Vulnerability Consequences:Denial of Service
References:Source: CCN
Type: Kernel Bug Tracker Bug 8765
NULL pointer dereference triggered by ptrace

Source: secalert@redhat.com
Type: Exploit
secalert@redhat.com

Source: MITRE
Type: CNA
CVE-2007-3731

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: CCN
Type: RHSA-2007-0940
Important: kernel security update

Source: CCN
Type: SA26935
Linux Kernel ptrace Single Step "CS" Null Pointer Dereference

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: DEBIAN
Type: DSA-1378
linux-2.6 -- several vulnerabilities

Source: CCN
Type: OSVDB ID: 37286
Linux Kernel Invalid LDT Segment Selector Local DoS

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: CCN
Type: BID-25801
Linux Kernel PTrace NULL Pointer Dereference Local Denial Of Service Vulnerability

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: CCN
Type: USN-518-1
Linux kernel vulnerabilities

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: Patch
secalert@redhat.com

Source: XF
Type: UNKNOWN
kernel-ldt-segment-dos(36681)

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Source: secalert@redhat.com
Type: UNKNOWN
secalert@redhat.com

Vulnerable Configuration:Configuration RedHat 1:
  • cpe:/o:redhat:enterprise_linux:5:*:*:*:*:*:*:*
    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:5::client:*:*:*:*:*
    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:5::server:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:2.6.21:-:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.20:-:*:*:*:*:*:*
  • AND
  • cpe:/o:canonical:ubuntu:6.06::lts:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:5:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:4.0:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu:7.04:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:5:*:client:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.mitre.oval:def:17343
    P
    		USN-518-1 -- linux-source-2.6.15/17/20 vulnerabilities
    2014-06-30
    oval:org.mitre.oval:def:18649
    P
    		DSA-1378-2 fai-kernels linux-2.6 user-mode-linux - several vulnerabilities
    2014-06-23
    oval:org.mitre.oval:def:20370
    P
    		DSA-1378-1 fai-kernels linux-2.6 user-mode-linux - several vulnerabilities
    2014-06-23
    oval:org.mitre.oval:def:21736
    P
    		ELSA-2007:0940: kernel security update (Important)
    2014-05-26
    oval:org.mitre.oval:def:10394
    V
    		The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in %cs (the xcs field) during ptrace single-step operations, which allows local users to cause a denial of service (NULL dereference and OOPS) via certain code that makes ptrace PTRACE_SETREGS and PTRACE_SINGLESTEP requests, related to the TRACE_IRQS_ON function, and possibly related to the arch_ptrace function.
    2013-04-29
    oval:com.redhat.rhsa:def:20070940
    P
    		RHSA-2007:0940: kernel security update (Important)
    2007-10-22
    oval:org.debian:def:1378
    V
    		several vulnerabilities
    2007-09-28
    BACK
    linux linux kernel 2.6.21
    linux linux kernel 2.6.20
    canonical ubuntu 6.06
    redhat enterprise linux 5
    debian debian linux 4.0
    canonical ubuntu 7.04
    redhat enterprise linux 5