CVE-2018-1000001

In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.

CVSS v3.0 7.8 HIGH
CVSS v2.0 7.2 HIGH

7.8^/10

CVSS v3.0 : HIGH

V3 Legend

Vector : AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.2^/10

CVSS v2.0 : HIGH

V2 Legend

Vector : AV:L/AC:L/Au:N/C:C/I:C/A:C

Exploitability : 3.9 / Impact : 10.0

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://www.halfdog.net/Security/2017/LibcRealpathBufferUnderflow/	Third Party Advisory
http://seclists.org/oss-sec/2018/q1/38	Mailing List Third Party Advisory
https://www.exploit-db.com/exploits/43775/	Exploit Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1040162	Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/102525	Third Party Advisory VDB Entry
https://usn.ubuntu.com/3536-1/	Third Party Advisory
https://usn.ubuntu.com/3534-1/	Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0805	Third Party Advisory
https://www.exploit-db.com/exploits/44889/	Exploit Third Party Advisory VDB Entry
https://security.netapp.com/advisory/ntap-20190404-0003/

Configurations

Configuration 1 (hide)

cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::
	cpe:2.3:o:canonical:ubuntu_linux:17.10:::::::*
	cpe:2.3:o:canonical:ubuntu_linux:12.04::::esm:::
	cpe:2.3:o:canonical:ubuntu_linux:14.04::::lts:::

Configuration 3 (hide)

OR	cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:::::::*
	cpe:2.3:a:redhat:virtualization_host:4.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:::::::*
	cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:::::::*
	cpe:2.3:o:redhat:enterprise_linux_server:7.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:::::::*

Information

Published : 2018-01-31 06:29

Updated : 2019-10-02 17:03

NVD link : CVE-2018-1000001

Mitre link : CVE-2018-1000001

JSON object : View

CWE

CWE-787

Out-of-bounds Write

Products Affected

redhat

enterprise_linux_desktop
enterprise_linux_server_aus
enterprise_linux_server_eus
enterprise_linux_workstation
enterprise_linux_server_tus
virtualization_host
enterprise_linux_server

canonical

ubuntu_linux

gnu

glibc

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://www.halfdog.net/Security/2017/LibcRealpathBufferUnderflow/", "name": "https://www.halfdog.net/Security/2017/LibcRealpathBufferUnderflow/", "tags": ["Third Party Advisory"], "refsource": "MISC"}, {"url": "http://seclists.org/oss-sec/2018/q1/38", "name": "[oss-security] 20180111 Libc Realpath Buffer Underflow CVE-2018-1000001", "tags": ["Mailing List", "Third Party Advisory"], "refsource": "MLIST"}, {"url": "https://www.exploit-db.com/exploits/43775/", "name": "43775", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "refsource": "EXPLOIT-DB"}, {"url": "http://www.securitytracker.com/id/1040162", "name": "1040162", "tags": ["Third Party Advisory", "VDB Entry"], "refsource": "SECTRACK"}, {"url": "http://www.securityfocus.com/bid/102525", "name": "102525", "tags": ["Third Party Advisory", "VDB Entry"], "refsource": "BID"}, {"url": "https://usn.ubuntu.com/3536-1/", "name": "USN-3536-1", "tags": ["Third Party Advisory"], "refsource": "UBUNTU"}, {"url": "https://usn.ubuntu.com/3534-1/", "name": "USN-3534-1", "tags": ["Third Party Advisory"], "refsource": "UBUNTU"}, {"url": "https://access.redhat.com/errata/RHSA-2018:0805", "name": "RHSA-2018:0805", "tags": ["Third Party Advisory"], "refsource": "REDHAT"}, {"url": "https://www.exploit-db.com/exploits/44889/", "name": "44889", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "refsource": "EXPLOIT-DB"}, {"url": "https://security.netapp.com/advisory/ntap-20190404-0003/", "name": "https://security.netapp.com/advisory/ntap-20190404-0003/", "tags": [], "refsource": "CONFIRM"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-787"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2018-1000001", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 7.2, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "LOW", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "severity": "HIGH", "acInsufInfo": false, "impactScore": 10.0, "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}}, "publishedDate": "2018-01-31T14:29Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "2.26"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*", "cpe_name": [], "vulnerable": true}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:a:redhat:virtualization_host:4.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2019-10-03T00:03Z"}

7.8 /10