Vulnerability Name:

CVE-2011-4080 (CCN-75875)

Assigned:2011-03-23
Published:2011-03-23
Updated:2023-02-13
Summary:The sysrq_sysctl_handler function in kernel/sysctl.c in the Linux kernel before 2.6.39 does not require the CAP_SYS_ADMIN capability to modify the dmesg_restrict value, which allows local users to bypass intended access restrictions and read the kernel ring buffer by leveraging root privileges, as demonstrated by a root user in a Linux Containers (aka LXC) environment.
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:L/A:N)
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): Low
Availibility (A): None
CVSS v2 Severity:4.0 Medium (CVSS v2 Vector: AV:L/AC:H/Au:N/C:C/I:N/A:N)
3.0 Low (Temporal CVSS v2 Vector: AV:L/AC:H/Au:N/C:C/I:N/A:N/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): High
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): None
Availibility (A): None
2.1 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N)
1.6 Low (CCN Temporal CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
1.5 Low (REDHAT CVSS v2 Vector: AV:L/AC:M/Au:S/C:P/I:N/A:N)
1.1 Low (REDHAT Temporal CVSS v2 Vector: AV:L/AC:M/Au:S/C:P/I:N/A:N/E:U/RL:OF/RC:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2011-4080

Source: secalert@redhat.com
Type: Broken Link
secalert@redhat.com

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

Source: CCN
Type: Linux Kernel GIT Repository
sysctl: restrict write access to dmesg_restrict

Source: secalert@redhat.com
Type: Mailing List, Third Party Advisory
secalert@redhat.com

Source: CCN
Type: OSVDB ID: 82467
Linux Kernel kernel/sysctl.c sysrq_sysctl_handler Function Local Privilege Escalation

Source: XF
Type: UNKNOWN
kernel-sysrqsysctl-sec-bypass(75875)

Source: secalert@redhat.com
Type: Patch, Third Party Advisory
secalert@redhat.com

Vulnerable Configuration:Configuration RedHat 1:
  • cpe:/o:redhat:enterprise_linux:6:*:*:*:*:*:*:*
    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:6::client:*:*:*:*:*
    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:6::computenode:*:*:*:*:*
    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:6::server:*:*:*:*:*
    • Configuration RedHat 5:
  • cpe:/o:redhat:enterprise_linux:6::workstation:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:2.6.9:rc4:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.9:rc3:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.9:rc2:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.9:rc1:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.8:rc4:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.8:rc3:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.8:rc2:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.8:rc1:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.8.1:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:2.6.9:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0:rc1:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0:rc2:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0:rc3:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0:rc4:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.5:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0:rc7:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0:rc5:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0:rc6:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.7:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.6:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.9:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.8:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.24:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.22:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.23:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.20:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.21:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.18:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.19:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.16:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.17:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.14:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.15:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.12:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.13:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.10:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:3.0.11:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.precise:def:20114080000
    V
    		CVE-2011-4080 on Ubuntu 12.04 LTS (precise) - low.
    2012-05-24
    oval:com.redhat.rhsa:def:20120481
    P
    		RHSA-2012:0481: kernel security, bug fix, and enhancement update (Moderate)
    2012-04-17
    BACK
    linux linux kernel 2.6.9 rc4
    linux linux kernel 2.6.9 rc3
    linux linux kernel 2.6.9 rc2
    linux linux kernel 2.6.9 rc1
    linux linux kernel 2.6.8 rc4
    linux linux kernel 2.6.8 rc3
    linux linux kernel 2.6.8 rc2
    linux linux kernel 2.6.8 rc1
    linux linux kernel 2.6.8.1
    linux linux kernel 2.6.9
    linux linux kernel 3.0 rc1
    linux linux kernel 3.0 rc2
    linux linux kernel 3.0 rc3
    linux linux kernel 3.0 rc4
    linux linux kernel 3.0.5
    linux linux kernel 3.0 rc7
    linux linux kernel 3.0 rc5
    linux linux kernel 3.0 rc6
    linux linux kernel 3.0.7
    linux linux kernel 3.0.6
    linux linux kernel 3.0.9
    linux linux kernel 3.0.8
    linux linux kernel 3.0.24
    linux linux kernel 3.0.22
    linux linux kernel 3.0.23
    linux linux kernel 3.0.20
    linux linux kernel 3.0.21
    linux linux kernel 3.0.18
    linux linux kernel 3.0.19
    linux linux kernel 3.0.16
    linux linux kernel 3.0.17
    linux linux kernel 3.0.14
    linux linux kernel 3.0.15
    linux linux kernel 3.0.12
    linux linux kernel 3.0.13
    linux linux kernel 3.0.10
    linux linux kernel 3.0.11