Unspecified vulnerability in Shim might allow attackers to execute arbitrary code via a crafted MOK list, which triggers memory corruption.

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. (CVE-2014-3676)

An out-of-bounds memory write flaw was found in the way shim processed certain Machine Owner Keys (MOKs). A local attacker could potentially use this flaw to execute arbitrary code on the system. (CVE-2014-3677)

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. (CVE-2014-3675)

The system must be rebooted for this update to take effect.

shim was updated to fix several security issues.

  - OOB read access when parsing DHCPv6 packets (remote DoS)     (CVE-2014-3675).

  - Heap overflow when parsing IPv6 addresses provided by     tftp:// DHCPv6 boot option (RCE) (CVE-2014-3676).

  - Memory corruption when processing user provided MOK     lists (CVE-2014-3677).

More information is available at https://bugzilla.novell.com/show_bug.cgi?id=889332

To enable this update gnu-efi was updated to 3.0u and pesign to version 0.109

shim has been updated to fix three security issues :

  - OOB read access when parsing DHCPv6 packets (remote     DoS). (CVE-2014-3675)

  - Heap overflow when parsing IPv6 addresses provided by     tftp:// DHCPv6 boot option (RCE). (CVE-2014-3676)

  - Memory corruption when processing user provided MOK     lists. (CVE-2014-3677)

This update fixes CVEs CVE-2014-3675, CVE-2014-3676, and CVE-2014-3677, as well as moving to the 0.8 release, which adds support for Aarch64 and fixes several bugs.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

From Red Hat Security Advisory 2014:1801 :

Updated shim packages that fix three security issues are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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. (CVE-2014-3676)

An out-of-bounds memory write flaw was found in the way shim processed certain Machine Owner Keys (MOKs). A local attacker could potentially use this flaw to execute arbitrary code on the system. (CVE-2014-3677)

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. (CVE-2014-3675)

Red Hat would like to thank the SUSE Security Team for reporting these issues.

All shim users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

Updated shim packages that fix three security issues are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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. (CVE-2014-3676)

An out-of-bounds memory write flaw was found in the way shim processed certain Machine Owner Keys (MOKs). A local attacker could potentially use this flaw to execute arbitrary code on the system. (CVE-2014-3677)

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. (CVE-2014-3675)

Red Hat would like to thank the SUSE Security Team for reporting these issues.

All shim users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

ID	Name	Product	Family	Severity
81294	Scientific Linux Security Update : shim on SL7.x x86_64 (20141104)	Nessus	Scientific Linux Local Security Checks	high
80926	openSUSE Security Update : gnu-efi / pesign / shim (openSUSE-2015-48)	Nessus	SuSE Local Security Checks	high
80024	SuSE 11.3 Security Update : shim (SAT Patch Number 9997)	Nessus	SuSE Local Security Checks	high
79195	Fedora 19 : mokutil-0.2.0-1.fc19 / shim-signed-0.8-2 (2014-14059)	Nessus	Fedora Local Security Checks	high
79194	Fedora 20 : mokutil-0.2.0-1.fc20 / shim-signed-0.8-3 (2014-14058)	Nessus	Fedora Local Security Checks	high
78882	Oracle Linux 7 : shim (ELSA-2014-1801)	Nessus	Oracle Linux Local Security Checks	high
78867	RHEL 7 : shim (RHSA-2014:1801)	Nessus	Red Hat Local Security Checks	high
78809	Fedora 21 : mokutil-0.2.0-1.fc21 / shim-0.8-1.fc22 / shim-signed-0.8-1.fc22 (2014-13581)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2014-3677

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Tenable Plugins

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