CVE-2014-3675

shim: out-of-bounds memory read flaw in DHCPv6 packet processing

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Shim allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted DHCPv6 packet.

Shim permite a atacantes remotos causar una denegación de servicio (lectura fuera de rango) a través de un paquete DHCPv6 manipulado.

An out-of-bounds memory read flaw was found in the way shim parsed certain IPv6 packets. A specially crafted DHCPv6 packet could possibly cause shim to crash, preventing the system from booting if IPv6 booting was enabled.

Shim is the initial UEFI bootloader that handles chaining to a trusted full bootloader under secure boot environments. A heap-based buffer overflow flaw was found the way shim parsed certain IPv6 addresses. If IPv6 network booting was enabled, a malicious server could supply a crafted IPv6 address that would cause shim to crash or, potentially, execute arbitrary code. An out-of-bounds memory write flaw was found in the way shim processed certain Machine Owner Keys. A local attacker could potentially use this flaw to execute arbitrary code on the system.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Attack Vector

Adjacent

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2014-05-14 CVE Reserved
2014-10-22 CVE Published
2024-08-06 CVE Updated
2025-03-31 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (6)

URL	Tag	Source
http://www.securityfocus.com/bid/70407	Third Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/96981	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2014/10/13/4	2021-04-07

URL	Date	SRC
http://rhn.redhat.com/errata/RHSA-2014-1801.html	2021-04-07
https://access.redhat.com/security/cve/CVE-2014-3675	2014-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1148230	2014-11-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Redhat Search vendor "Redhat"		Shim Search vendor "Redhat" for product "Shim"				>= 0.3 < 0.8 Search vendor "Redhat" for product "Shim" and version " >= 0.3 < 0.8"		-		Affected