CVE-2011-0997
Scores
EPSS
Percentile: 81.4%
CVSS
CVSS Score: 7.9/10
All CVSS Scores
Vector: AV:A/AC:M/Au:N/C:C/I:C/A:C
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Adjacent Network (A)
Describes how the vulnerability is exploited
Attack Complexity
Medium
Describes the conditions beyond the attacker's control
Authentication
None (N)
Describes the level of privileges an attacker must possess
Confidentiality Impact
Complete
Measures the impact to the confidentiality of information
Integrity Impact
Complete
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
Complete
Measures the impact to the availability of the impacted component
Description
dhclient in ISC DHCP 3.0.x through 4.2.x before 4.2.1-P1, 3.1-ESV before 3.1-ESV-R1, and 4.1-ESV before 4.1-ESV-R2 allows remote attackers to execute arbitrary commands via shell metacharacters in a hostname obtained from a DHCP message, as demonstrated by a hostname that is provided to dhclient-script.
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Sources
CWEs
Related Vulnerabilities
Recommendations
Source: nvd
Apply an updateUsers who obtain ISC DHCP from a third-party vendor, such as their operating system vendor, should see the vendor information portion of this document for a partial list of affected vendors.This vulnerability is addressed in ISC DHCP version 3.1-ESV-R1, 4.1-ESV-R2 and 4.2.1-P1. Users of ISC DHCP from the original source distribution should upgrade to this version or later, as appropriate.See also https://www.isc.org/software/dhcp/advisories/cve-2011-0997According to ISC:On SUSE systems, it is possible to disable hostname update by setting DHCLIENT_SET_HOSTNAME=“no” in /etc/sysconfig/network/dhcp.Other systems may add following line to dhclient-script at the beginning of the set_hostname() function:new_host_name=${new_host_name//[^-.a-zA-Z0-9]/}In environments where filters/acls can be put into place to limit clients to accessing only legitimate dhcp servers, this will protect clientsfrom rogue dhcp servers deliberately trying to exploit this bug. However, this will not protect from compromised servers.
Vulnerable Software (11)
Type: Configuration
Product: dhcp
Operating System: rhel 3
{ "fixed": "3.0.1-10.3_EL3"}
Source: redhat
Type: Configuration
Product: dhcp
Operating System: rhel 4
{ "fixed": "3.0.1-67.el4"}
Source: redhat
Type: Configuration
Product: dhcp
Operating System: rhel 5
{ "fixed": "3.0.5-23.el5_6.4"}
Source: redhat
Type: Configuration
Product: dhcp
Operating System: rhel 6
{ "fixed": "4.1.1-12.P1.el6_0.4"}
Source: redhat
Type: Configuration
Product: dhcp3
Operating System: ubuntu hardy 8.04
{ "fixed": "3.0.6.dfsg-1ubuntu9.2"}
Source: ubuntu
Type: Configuration
Product: dhcp3
Operating System: debian
{ "unfixed": true}
Source: debian
Type: Configuration
Product: isc-dhcp
Operating System: debian
{ "fixed": "4.1.1-P1-16.1"}
Source: debian
Type: Configuration
Vendor: canonical
Product: ubuntu_linux
Operating System: * * *
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*...
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:lts:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:9.10:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:lts:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:canonical:ubuntu_linux:10.10:*:*:*:*:*:*:*", "vulnerable": true } ], "operator": "OR"}
Source: nvd
Type: Configuration
Vendor: debian
Product: debian_linux
Operating System: * * *
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*",...
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*", "vulnerable": true } ], "operator": "OR"}
Source: nvd
Type: Configuration
Vendor: isc
Product: dhcp
Operating System: * * *
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:-:*:*:*:*:*:*", "vulnerable":...
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc10:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc11:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc12:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc13:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc14:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc2:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc5:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc6:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc7:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc8:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.1:rc9:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.2:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.2:b1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.2:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.2:rc2:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.2:rc3:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.3:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.3:b1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.3:b2:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.3:b3:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.4:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.4:b1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.4:b2:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.4:b3:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.4:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.5:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.5:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.0.6:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1-esv:*:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.0:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.0:a1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.0:a2:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.0:a3:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.0:b1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.0:b2:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.0:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.1:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.1:rc2:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.2:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.2:b1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.2:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.3:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.3:b1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:3.1.3:rc1:*:*:*:*:*:*", "vulnerable": true } ], "operator": "OR"}
Source: nvd
Type: Configuration
Vendor: isc
Product: dhcp
Operating System: * * *
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.1-esv:rc1:*:*:*:*:*:*", "vuln...
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.1-esv:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.0:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.0:a1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.0:a2:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.0:b1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.0:b2:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.0:p1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.0:rc1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.1:-:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.1:b1:*:*:*:*:*:*", "vulnerable": true }, { "cpe23uri": "cpe:2.3:a:isc:dhcp:4.2.1:rc1:*:*:*:*:*:*", "vulnerable": true } ], "operator": "OR"}
Source: nvd