Category Archives: Security Alert

Enterprise Networking Operating System Authentication Bypass in Lenovo and IBM RackSwitch and BladeCenter Products [CVE-2017-3765]

Lenovo Security Advisory: LEN-16095

Potential Impact:  An attacker could gain access to the switch management interface, permitting settings changes that could result in exposing traffic passing through the switch, subtle malfunctions in the attached infrastructure, and partial or complete denial of service.

Severity: High

Scope of Impact: Lenovo-specific

CVE Identifier: CVE-2017-3765

Summary Description:

ENOS, or Enterprise Network Operating System, is the firmware that powers some Lenovo and IBM RackSwitch and BladeCenter switches. An authentication bypass mechanism known as “HP Backdoor” was discovered during a Lenovo security audit in the Telnet and Serial Console management interfaces, as well as the SSH and Web management interfaces under certain limited and unlikely conditions. This bypass mechanism can be accessed when performing local authentication under specific circumstances using credentials that are unique to each switch. If exploited, admin-level access to the switch is granted.

CNOS, or Cloud Network Operating System, firmware is not vulnerable to this issue.

These ENOS interfaces and authentication configurations are vulnerable to this issue:

  • Telnet and Serial Console when performing local authentication, or a combination of RADIUS, TACACS+, or LDAP and local authentication under specific circumstances described below
  • Web when performing a combination of RADIUS or TACACS+ and local authentication combined with an unlikely condition under specific circumstances described below
  • SSH for certain firmware released in May 2004 through June 2004 (only) when performing a combination of RADIUS or TACACS+ and local authentication under specific circumstances described below; the vulnerable code is present in more recent firmware, but not used

Other interfaces and authentication configurations are not vulnerable to this issue:

  • SSH in firmware released after June 2004 are not vulnerable
  • SSH and Web using only local authentication are not vulnerable
  • SSH, Web, Telnet, and Serial Console using LDAP, RADIUS, or TACACS+ without use of local authentication fallback are not vulnerable
  • Other management interfaces, such as SNMP, are not vulnerable

A source code revision history audit revealed that this authentication bypass mechanism was added in 2004 when ENOS was owned by Nortel’s Blade Server Switch Business Unit (BSSBU). The mechanism was authorized by Nortel and added at the request of a BSSBU OEM customer.  Nortel spun BSSBU off in 2006 to form BLADE Network Technologies (BNT). BNT was purchased by IBM in 2010, and, subsequently, Lenovo in 2014.

Lenovo has provided relevant source code to a third-party security partner to enable independent investigation of the mechanism.

The existence of mechanisms that bypass authentication or authorization are unacceptable to Lenovo and do not follow Lenovo product security or industry practices. Lenovo has removed this mechanism from the ENOS source code and has released updated firmware for affected products.

Lenovo is not aware of this mechanism being exploited, but we assume that its existence is known, and customers are advised to upgrade to firmware which eliminates it.

Mitigation Strategy for Customers (what you should do to protect yourself):

Upgrade to the ENOS firmware version described in the product impact section below.

If upgrading is not immediately possible, then the surest option is to do all the following:

  • Enable LDAP, RADIUS, or TACAS+ remote authentication AND
  • For any of LDAP, RADIUS, or TACAS+ that are enabled, disable the related “Backdoor” and “Secure Backdoor” local authentication fallback settings AND
  • Disable Telnet AND
  • Restrict physical access to the serial console port

If doing all this is not desired, it may be possible to do a more limited set of actions based on the specifics of your environment. The precise circumstances for the vulnerability are:

SSH management interfaces are vulnerable if:

  • ENOS firmware being used was created between May 2004 and June 2004 AND
  • One or more of RADIUS or TACAS+ is enabled AND the related “Backdoor” or “Secure Backdoor” local authentication fallback is enabled AND a RADIUS or TACAS+ authentication timeout occurs

Note: LDAP is not vulnerable for these interfaces




Note: Local-only authentication is not vulnerable for these interfaces

Web management interfaces are vulnerable if:

  • An unlikely internal out of order execution condition (race condition) occurs AND
  • One or more of RADIUS or TACAS+ is enabled AND the related “Backdoor” or “Secure Backdoor” local authentication fallback is enabled AND a RADIUS or TACAS+ authentication timeout occurs

Note: LDAP is not vulnerable for these interfaces

Note: Local-only authentication is not vulnerable for these interfaces

Telnet and Serial Console management interfaces are vulnerable if:

  • LDAP, RADIUS, and TACAS+ are all disabled OR
  • One or more of LDAP, RADIUS, or TACAS+ are enabled AND the related “Backdoor” or “Secure Backdoor” local authentication fallback is enabled AND an LDAP, RADIUS, or TACAS+ authentication timeout occurs

For clarity, references to “Backdoor” and “Secure Backdoor” in the Mitigation Strategy for Customers section refer to local authentication fallback mechanisms and not the authentication bypass mechanism described in this advisory.  “Backdoor” in the authentication fallback context is an industry standard term used when configuring RADIUS and TACACS+.

Product Impact:

Lenovo Switches

IBM Switches

For a complete list of all Lenovo Product Security Advisories, click here.



Fake Spectre And Meltdown Patches Spread Smoke Loader Malware

A new variant of the Smoke Loader malware has been observed being distributed via fake patches for the Meltdown and Spectre vulnerabilities.

Fraudulent updates are purported to be from the German Federal Office for Information Security have been used as a delivery mechanism for the malware. The patches claim to fix the recent Intel vulnerabilities and as such are likely to receive greater attention by users.

German authorities recently warned about phishing emails trying to take advantage of those infamous bugs.

Once downloaded, the malware injects itself into explorer.exe before communicating with its Command and Control (C2) server to install the latest version of itself. These updated samples are packaged using a different encryption scheme to make detection harder, before being stored in a hidden subfolder.

Smoke Loader will attempt to maintain persistence through the addition of new registry keys and uses partially encrypted code with redundant jumps as an anti-forensics tool. It also performs environment checks to avoid being executed in a controlled environment and will ensure network connection by connecting to various legitimate sites before initiating C2 communications.

Fake Patch

sicherheit-informationstechnik.bid/Download/Sicherheitsupdate/Intel-AMD-SecurityPatch-11-01bsi.zip

Command And Control Servers

Please block the following domains :-

coolwater-ltd-supportid[.]ru
localprivat-support[.]ru
service-consultingavarage[.]ru
sicherheit-informationstechnik[.]bid

Affected Platforms

Microsoft Windows – All versions



Microsoft Excel 2010 Security Update 4011660

This security update resolves vulnerabilities in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file. To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2018-0796.

Note To apply this security update, you must have the release version of Service Pack 2 for Office 2010 installed on the computer.

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2010. It doesn’t apply to the Office 2010 Click-to-Run editions, such as Microsoft Office 365 Home (see Determining your Office version).

This security update replaces previously released security update KB 4011197.

How to get and install the update

Method 1: Microsoft Update

This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Method 3: Microsoft Download Center

You can get the stand-alone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.




HPE Integrated Lights Out 2 Multiple Remote Vulnerabilities

Multiple vulnerabilities in HPE Integrated Lights-Out 2 (iLO2) firmware could allow an unauthenticated, remote attacker to execute arbitrary code, bypass authentication, or cause a denial of service (DoS) condition on a targeted system.

The vulnerabilities are due to an unspecified condition that exist in the affected firmware. An attacker could exploit these vulnerabilities to execute arbitrary code, bypass authentication, or cause a DoS condition on a targeted system. A successful exploit could result in a complete system compromise.

HPE has confirmed these vulnerabilities and released software updates.

Analysis
  • Limited details are available to describe these vulnerabilities. However, a successful exploit of these vulnerabilities may result in a complete system compromise.
Safeguards
  • Administrators are advised to apply the appropriate updates.

    Administrators are advised to allow only trusted users to have network access.

    Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

    Administrators are advised to monitor affected systems.

Vendor Announcements
  • HPE has released a security bulletin at the following link: HPESBHF03797
Fixed Software

Affected Products

HP Integrated Lights Out 2 (iLO-2) firmware – 2.29 (Base)




Juniper Junos J-Web Use-After-Free Memory Error Remote Code Execution Vulnerability

A vulnerability in the J-Web interface of Juniper Junos could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.

The vulnerability is due to a use-after-free vulnerability in the affected interface. An attacker could exploit this vulnerability by submitting crafted data to the affected system. A successful exploit could allow the attacker to execute arbitrary code on the system.

Juniper Networks confirmed the vulnerability in a security bulletin and released software updates.

Analysis
To exploit this vulnerability, the attacker must have access to a targeted device. This access requirement reduces the likelihood of a successful exploit.
Safeguards
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
Vendor Announcements
Juniper Networks has released a security bulletin at the following link: JSA10828
Fixed Software
Juniper customers are advised to obtain software upgrades as described in the Juniper Networks security bulletin.




Trojan Downloader – Win32/Jadtre.A

TrojanDownloader:Win32/Jadtre.A is a trojan that downloads and executes arbitrary files. It also prevents certain processes from executing normally.

Threat behavior

TrojanDownloader:Win32/Jadtre.A is a trojan that downloads and executes arbitrary files. It also prevents certain processes from executing normally.
Installation
TrojanDownloader:Win32/Jadtre.A is dropped and installed as a replaced system service DLL by TrojanDropper:Win32/Jadtre.B.
Payload
Downloads and executes arbitrary files
TrojanDownloader:Win32/Jadtre.A contacts remote hosts to download and execute files of the attackers’s choice on the affected system. In the wild, TrojanDownloader:Win32/Jadtre.A has been observed contacting the following domain for this purpose:
  • ipdown.poloi999.cn
At the time of this writing, the downloaded files are detected as Worm:Win32/Viking.NA and TrojanSpy:Win32/Hitpop.gen!C.




Hijacks image file execution options
TrojanDownloader:Win32/Jadtre.A modifies the registry to hijack the Image File Execution Options for cetain processes to prevent normal execution:
Adds value: “Debugger
With data: “ntsd-d
To subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\<process>
where <process> could be any one of the following:
360hotfix.exe
360rpt.exe
360safe.exe
360safebox.exe
360tray.exe
agentsvr.exe
apvxdwin.exe
ast.exe
avcenter.exe
avengine.exe
avgnt.exe
avguard.exe
avltmain.exe
avp32.exe
avtask.exe
bdagent.exe
bdwizreg.exe
boxmod.exe
ccapp.exe
ccenter.exe
ccevtmgr.exe
ccregvfy.exe
ccsetmgr.exe
cqw32.exe
DrvAnti.exe
egui.exe
ekrn.exe
frameworkservice.exe
frwstub.exe
guardfield.exe
iparmor.exe
kaccore.exe
kasmain.exe
kav32.exe
kavstart.exe
kavsvc.exe
kavsvcui.exe
kislnchr.exe
kmailmon.exe
knownsvr.exe
kpfw32.exe
kpfwsvc.exe
kregex.exe
kvfw.exe
kvmonxp.exe
kvmonxp.kxp
kvol.exe
kvprescan.exe
kvsrvxp.exe
kvwsc.exe
kvxp.kxp
kwatch.exe
livesrv.exe
mcagent.exe
mcdash.exe
mcdetect.exe
mcshield.exe
mctskshd.exe
mcvsescn.exe
mcvsshld.exe
mghtml.exe
naprdmgr.exe
navapsvc.exe
navapw32.exe
navw32.exe
nmain.exe
nod32.exe
nod32krn.exe
nod32kui.exe
npfmntor.exe
oasclnt.exe
pavsrv51.exe
pfw.exe
psctrls.exe
psimreal.exe
psimsvc.exe
qqdoctormain.exe
ras.exe
ravmon.exe
ravmond.exe
ravstub.exe
ravtask.exe
rfwcfg.exe
rfwmain.exe
rfwproxy.exe
rfwsrv.exe
rsagent.exe
rsmain.exe
rsnetsvr.exe
rssafety.exe
rstray.exe
safebank.exe
safeboxtray.exe
scan32.exe
scanfrm.exe
sched.exe
seccenter.exe
secnotifier.exe
SetupLD.exe
shstat.exe
smartup.exe
sndsrvc.exe
spbbcsvc.exe
symlcsvc.exe
tbmon.exe
uihost.exe
ulibcfg.exe
updaterui.exe
uplive.exe
vcr32.exe
vcrmon.exe
vptray.exe
vsserv.exe
vstskmgr.exe
vstskmgr.exe
webproxy.exe
xcommsvr.exe
xnlscn.exe
Most of these processes are associated with antivirus and security products.




Three Vulnerabilities – Dell Avamar Zero-Day

Three vulnerabilities have been discovered in the Avamar Installation Manager (AVI) common to a number of Dell EMC virtual appliances. Exploitation of these vulnerabilities may allow an unauthorised local attacker to gain root access to a system.

The first vulnerability exploits the “getFileContents” method of the “UserInputService” class. This method does not perform any validation of filename parameters supplied by a user before retrieving the requested file. Additionally, the web server serving these request runs as root, meaning any file can be retrieved.

The second vulnerability allows a user to upload files to an arbitrary location. The “saveFileContents” method of the “UserInputService” accepts a single string and splits it on a specific character. The first half of the string describes the filepath, with the second describing the data to be written.

The final vulnerability can be combined with the first two to fully compromise a system. Authentication is performed via a POST including username, password and wsURL parameters, an arbitrary URL used by the server to send a Simple Object Access Protocol (SOAP) request. If this SOAP request is successful a valid session ID is returned, a properly formed request will work across multiple servers.

Dell’s security advisory is here ESA-2018-001, but requires Dell EMC Online Support credentials.

Affected Platforms

  • Dell EMC Avamar Server 7.1.x, 7.2.x, 7.3.x, 7.4.x, 7.5.0
  • Dell EMC NetWorker Virtual Edition (NVE) 9.0.x, 9.1.x, 9.2.x
  • Dell EMC Integrated Data Protection Appliance (IDPA) 2.0

Resolution

Dell EMC have confirmed all vulnerabilities have been fixed through advisory ESA-2018-001.
EMC recommends all customers install the patches below for their respective product versions at the earliest opportunity:

EMC Avamar Server version 7.1.2 – HOTFIX 290550
EMC Avamar Server version 7.2.1 – HOTFIX 290025
EMC Avamar Server version 7.3.1 – HOTFIX 290316
EMC Avamar Server version 7.4.1 – HOTFIX 289959
EMC Avamar Server version 7.5.0 – HOTFIX 289958
EMC NetWorker Virtual Edition version 9.0.x, 9.1.x, 9.2.x – HOTFIX 290317
EMC Integrated Data Protection Appliance version 2.x – HOTFIX 581676

Workaround

Disable Avamar Installation Manager (AVI).



Multiple Vulnerabilities In Wireshark Could Allow A Denial Of Service Attack

Multiple vulnerabilities in Wireshark could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.

The vulnerabilities are due to improper processing of malformed packets by the affected software. An attacker could exploit these vulnerabilities by transmitting malformed data packets to a targeted system that has the Wireshark application installed or by persuading a user to use the affected software to open a malformed packet trace file. A successful exploit could cause the application to stop functioning properly or to crash, resulting in a DoS condition.

Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.

CVE Numbers :-

CVE-2018-5334
CVE-2018-5335
CVE-2018-5336

Wireshark has released security advisories at the following links:

Wireshark has released software updates at the following link: Wireshark version 2.4.4 and 2.2.12 or later



VMware Workstation and Fusion Network Address Translation Service Use-After-Free Vulnerability

A vulnerability in the VMware Network Address Translation (NAT) service feature of VMware Workstation and Fusion could allow an authenticated, remote attacker on a guest system to execute arbitrary code on the host system.

The vulnerability is due to improper processing of IPv6 packets by the VMware NAT service of the affected software. An attacker on a guest system could exploit this vulnerability by sending crafted IPv6 packets to the targeted system. An exploit could trigger a use-after-free condition that the attacker could use to execute arbitrary code on the host system.

VMware has confirmed the vulnerability and released software updates.

CVE Number – CVE-2017-4949

Analysis

To exploit this vulnerability, an attacker must have access to a guest system to send malicious IPv6 packets to the targeted host system. This access requirement may reduce the likelihood of a successful exploit.

For a successful exploit to occur, IPv6 mode must be enabled on systems running an affected software version. By default, IPv6 mode for VMware NAT service is not enabled.

Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators are advised to monitor affected systems.

Affected Products

VMware Fusion – 8.1 (.0, .1) | 8.0 (.0, .0.1, .0.2, .1, .2) | 8.5 (.0, .1, .2, .3, .4, .5, .6, .7, .8, .9) | 10.0 (.0, .1) | 10.1 (.0)

VMware Workstation Player – 12.1 (.0, .1) | 12.0 (.0, .1) | 12.5 (.0, .1, .2, .3, .4, .5, .6, .7, .8) | 14.0 (.0) | 14.1 (.0)

VMware Workstation Pro – 12.0 (.0, .1) | 12.1 (.0, .1) | 12.5 (.0, .1, .2, .3, .4, .5, .6, .7, .8) | 14.0 (.0) | 14.1 (.0)

Vendor Announcements

VMware has released a security advisory at the following link: VMSA-2018-0005

Fixed Software

VMware has released software updates at the following links:




Ruby Rails Gem Cross-Site Scripting Vulnerability

CVE Number – CVE-2017-12097

A vulnerability in the delayed_job_web rails gem could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack on a targeted system.

The vulnerability is due to insufficient validation of user-supplied input processed by the affected software. An attacker could exploit this vulnerability by sending a user an email message that contains a malicious link and persuading the user to click the link. A successful exploit could allow the attacker to execute arbitrary JavaScript code in the context of the user’s browser, which could be used to conduct further attacks.

The vendor has not confirmed the vulnerability and software updates are not available.

Analysis

To exploit this vulnerability, the attacker may use misleading language or instructions to persuade a user to click a malicious link.

Cisco Talos has released a vulnerability report and a blog post for this vulnerability at the following links: Talos-2017-0449 and Vulnerability Spotlight: Ruby Rails Gem XSS Vulnerabilities

Safeguards
Administrators are advised to contact the vendor regarding future updates and releases.

Administrators are advised to allow only trusted users to have network access.

Users should verify that unsolicited links are safe to follow.

Administrators are advised to monitor affected systems.

For additional information about cross-site scripting attacks and the methods used to exploit these vulnerabilities, see the Cisco Applied Mitigation Bulletin Understanding Cross-Site Scripting (XSS) Threat Vectors.

Vendor Announcements

Vendor announcements are not available.

Affected Products

RubyGems        rails_admin               1.2 (Base, .0)

Fixed Software

Software patches are not available.