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Vulnerability Alert

GnuTLS Server Hello Session ID Buffer Overflow Remote Code Execution Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:34524
Version:6
First Published:2014 June 03 16:25 GMT
Last Published:2014 July 16 12:46 GMT
Port: Not available
CVE:CVE-2014-3466
BugTraq ID:67741
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.0
Related Resources:
View related IPS Signature
 
 
Version Summary:Oracle has released a security advisory and patch to address the GnuTLS Server hello session ID buffer overflow remote code execution vulnerability.
 
 
Description
GnuTLS contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.

The vulnerability is due to improper bounds checks performed on session IDs from Server Hello packets of the TLS/SSL handshake by the affected software. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted Server Hello session ID value. An exploit could allow an attacker to execute arbitrary code on the system.

GnuTLS.org has confirmed the vulnerability and released software updates.
 
Warning Indicators
GnuTLS versions prior to 3.1.25, 3.2.15, and 3.3.4 are vulnerable.
 
IntelliShield Analysis
To exploit the vulnerability, the attacker must have access to trusted or internal networks to send a crafted Server Hello session ID value to the targeted system. This access requirement could limit the likelihood of a successful exploit.
 
Vendor Announcements
GnuTLS.org has released a security advisory at the following link: GNUTLS-SA-2014-3

FreeBSD has released a VuXML document at the following link: gnutls -- client-side memory corruption

Oracle has released a security advisory at the following link: CVE-2014-3466

Red Hat has released an official CVE statement and security advisories for bug 1101932 at the following links: CVE-2014-3466, RHSA-2014:0594, RHSA-2014:0684, RHSA-2014:0815, and RHSA-2014:0595
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to trigger a buffer overflow condition and execute arbitrary code on a targeted system.
 
Technical Information
The vulnerability exists in the read_server_hello() and _gnutls_read_server_hello() functions in the session_id_len parameter of the affected software, which may perform improper bounds checks on session IDs from Server Hello packets.

An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted Server Hello session ID value to the affected software. Processing the value may trigger a buffer overflow, resulting in a memory corruption error. The attacker could use the memory corruption error to execute arbitrary code on the targeted system.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Users are advised not to open email messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in email messages are safe, they are advised not to open them.

Administrators are advised to monitor affected systems.
 
Patches/Software
GnuTLS.org has released updated versions at the following links: CentOS packages can be updated using the up2date or yum command.

FreeBSD has released ports collection updates at the following link: Ports Collection Index

Oracle has released a patch for registered users at the following link: Solaris 11.1.21.4.1

Red Hat has released updated software for registered subscribers at the following link: Red Hat Network. Red Hat packages can be updated on Red Hat Enterprise Linux versions 5 and later using the yum tool.

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
4395/0GnuTLS Server Hello Session ID Buffer OverflowS8062014 Jun 10 
 
Alert History
 

Version 5, July 2, 2014, 10:13 AM: Red Hat has released additional security advisories and updated packages to address the GnuTLS Server hello session ID buffer overflow remote code execution vulnerability.

Version 4, June 11, 2014, 8:56 AM: Red Hat has released an additional security advisory and updated packages to address the GnuTLS Server hello session ID buffer overflow remote code execution vulnerability.

Version 3, June 5, 2014, 12:33 PM: CentOS has released updated packages to address the GnuTLS Server hello session ID buffer overflow remote code execution vulnerability.

Version 2, June 4, 2014, 10:18 AM: Red Hat has released a security advisory and updated packages to address the GnuTLS Server hello session ID buffer overflow remote code execution vulnerability. FreeBSD has also released a VuXML document and updated ports collection to address this vulnerability.

Version 1, June 3, 2014, 12:25 PM: GnuTLS contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. Updates are available.


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
GNU Public LicenseGnuTLS 3.1 Base, .1, .2, .3, .4, .5, .6, .7, .8, .9, .10, .11, .12, .13, .14, .15, .16, .17, .18, .19, .20, .21, .22, .23, .24 | 3.2 Base, .1, .2, .3, .4, .5, .6, .7, .8, .9, .10, .11, .12, .13, .14 | 3.3 Base, .1, .2, .3

Associated Products:
CentOS ProjectCentOS 5 .0 i386, .0 x86_64, .1 i386, .1 x86_64, .2 i386, .2 x86_64, .3 i386, .3 x86_64, .4 i386, .4 x86_64, .5 i386, .5 x86_64
FreeBSD ProjectFreeBSD 6.3 Base | 6.4 Base | 7.0 Base | 7.1 Base | 7.2 Base | 7.3 Base | 7.4 Base | 8.0 Base | 8.1 Base | 8.2 Base | 8.3 Base | 9.0 Base | 9.1 Base | 9.2 Base | 10.0 Base
Oracle CorporationSolaris 11.1 Base
Red Hat, Inc.Red Hat Enterprise Linux 5 IA-32, IA-64, PPC, ppc64, s390, s390x, x86_64 | 7 Base
Red Hat, Inc.Red Hat Enterprise Linux Server AUS 6.5 x86_64
Red Hat, Inc.Red Hat Enterprise Linux Desktop 5 IA-32, x86_64 | 6 IA-32, x86_64
Red Hat, Inc.Red Hat Enterprise Linux Desktop Workstation 5 IA-32, x86-64
Red Hat, Inc.Red Hat Enterprise Linux HPC Node 6 x86_64
Red Hat, Inc.Red Hat Enterprise Linux Server 6 IA-32, PPC, PPC 64, s390, s390x, x86_64
Red Hat, Inc.Red Hat Enterprise Linux Server EUS 6.5.z IA-32, PPC, PPC64, s390, s390x, x86_64
Red Hat, Inc.Red Hat Enterprise Linux Workstation 6 IA-32, x86_64
Red Hat, Inc.Red Hat Enterprise Virtualization 3.0 x86_64




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