The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a database and tools to fix them.
History of vulnerabilities analyzed by Vigil@nce:

cybersecurity note CVE-2007-3770

Xfce: code execution via Terminal

Synthesis of the vulnerability

The Terminal emulator of Xfce does not correctly check urls before calling web browser.
Severity: 1/4.
Creation date: 16/08/2007.
Identifiers: 184886, BID-24889, CVE-2007-3770, DSA-1393-1, FEDORA-2007-1620, VIGILANCE-VUL-7099.
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Description of the vulnerability

The Xfce Terminal emulator automatically recognizes urls it displays, and proposes user to open them. In order to do so, web browser is called via a command like:
  /bin/sh -c "browser url"

However, url is not sanitized before being included in the shell command. For example, following url:
  http://attacker/?$HOME
runs:
  browser http://attacker/?_here_the_home_directory_

An attacker can therefore create a text document containing malicious urls, then invite victim to open them via Terminal, in order to execute shell commands with his privileges.
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weakness bulletin CVE-2007-4367

Opera: code execution via JavaScript

Synthesis of the vulnerability

An attacker can create a malicious HTML document using JavaScript in order to execute code on computer of victim.
Severity: 4/4.
Creation date: 16/08/2007.
Identifiers: BID-25331, CVE-2007-4367, SUSE-SA:2007:050, VIGILANCE-VUL-7098.
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Description of the vulnerability

The Opera browser parses JavaScript code contained in HTML documents before running it.

Malformed JavaScript code forces Opera to incorrectly interpret a function definition. When this function is run, code is executed.

An attacker can therefore create a malicious HTML document using JavaScript in order to execute code on computer of victim.
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threat announce CVE-2007-3105

Linux kernel: buffer overflow via read_wakeup_threshold

Synthesis of the vulnerability

When administrator changed the default configuration of random generator, a local attacker can generate an overflow.
Severity: 1/4.
Creation date: 16/08/2007.
Identifiers: BID-25348, CERTA-2002-AVI-162, CVE-2007-3105, DSA-1363-1, DSA-1504-1, FEDORA-2007-1785, FEDORA-2007-679, MDKSA-2007:195, MDKSA-2007:196, MDKSA-2007:216, RHSA-2007:0939-01, RHSA-2007:0940-01, SUSE-SA:2007:051, SUSE-SA:2007:053, VIGILANCE-VUL-7097.
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Description of the vulnerability

The sysctl command permits administrator to change parameters of random generator:
 - kernel.random.read_wakeup_threshold : minimum number of bits of entropy to have before returning data via /dev/random (default 64)
 - kernel.random.poolsize : size of pool (default 512)

If administrator configures read_wakeup_threshold to be over to poolsize, a buffer overflow can occur.

As written data are random, this vulnerability generally leads to a denial of service. Code execution seems to be difficult to achieve.
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threat note CVE-2007-4414 CVE-2007-4415 CVE-2011-2678

Cisco VPN Client: privilege elevation

Synthesis of the vulnerability

A local attacker can elevate his privileges via the Cisco VPN Client.
Severity: 2/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 16/08/2007.
Revisions dates: 17/08/2007, 25/03/2011, 05/07/2011.
Identifiers: 91923, BID-25332, cisco-sa-20070815-vpnclient, CSCse89550, CSCsj00785, CSCtn50645, CVE-2007-4414, CVE-2007-4415, CVE-2011-2678, NGS00051, NGS00503, VIGILANCE-VUL-7096.
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Description of the vulnerability

Windows version of Cisco VPN Client has two vulnerabilities.

A local attacker can enable the SBL (Start Before Logon) feature and use Microsoft Dial-Up Networking in order to execute commands with LocalSystem privileges. [severity:2/4; CSCse89550, CVE-2007-4414]

Permissions on the cvpnd.exe file permit a local attacker to replace it by a Trojan horse. This file is the Cisco VPN Service run with LocalSystem privileges. [severity:2/4; CSCsj00785, CSCtn50645, CVE-2007-4415, NGS00051, NGS00503]
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computer vulnerability CVE-2007-3848

Linux kernel: sending a signal to a privileged process

Synthesis of the vulnerability

A local attacker can send a signal to a suid or sgid process he executes.
Severity: 1/4.
Creation date: 16/08/2007.
Revision date: 17/08/2007.
Identifiers: BID-25387, CVE-2007-3848, DSA-1356-1, DSA-1503-1, DSA-1504-1, FEDORA-2007-1785, FEDORA-2007-679, MDKSA-2007:195, MDKSA-2007:196, RHSA-2007:0939-01, RHSA-2007:0940-01, RHSA-2007:1049-01, RHSA-2008:0787-01, RHSA-2009:0001-01, SUSE-SA:2007:051, SUSE-SA:2007:053, SUSE-SA:2008:006, SUSE-SA:2008:017, VIGILANCE-VUL-7095.
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Description of the vulnerability

The PR_SET_PDEATHSIG parameter of prctl() function defines signal to send to child process when parent process ends.

Users are not normally allowed to send a signal to a privileged (suid/sigd) process they run. However, a local attacker can use following procedure:
 - create a program calling fork() to create a child process
 - in the child process, use PR_SET_PDEATHSIG to define a signal
 - in the child process, use execve("suid_program1") to replace process by the privileged program where to send the signal to
 - in the parent process, use execve("suid_root_program2") to replace process by the privileged program which will send the signal
 - kill the parent process
Parent process (suid_root_program2) thus sends the ending signal to its child process (suid_program1). This operation is allowed because parent is root.

This vulnerability thus permits a local attacker to send a signal to a suid or sgid program he runs. This signal can for example force program to achieve unwanted operations.
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security note CVE-2007-3513

Linux kernel: denial of service via usblcd

Synthesis of the vulnerability

A local attacker can exhaust system memory by using usblcd.
Severity: 1/4.
Creation date: 16/08/2007.
Identifiers: BID-24734, CVE-2007-3513, DSA-1356-1, MDKSA-2007:195, MDKSA-2007:196, RHSA-2007:0940-01, SUSE-SA:2007:051, SUSE-SA:2007:053, VIGILANCE-VUL-7094.
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Description of the vulnerability

The drivers/usb/misc/usblcd.c driver permits to use a LCD mini-screen connected to a USB port.

The lcd_write() function does not limit size of used memory.

A local attacker, allowed to write to the mini-screen, can therefore create a denial of service by exhausting system memory.
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weakness note CVE-2007-1749

IE: buffer overflow of VML

Synthesis of the vulnerability

An attacker can create a HTML document containing malicious VML data in order to execute code on victim's computer.
Severity: 4/4.
Creation date: 16/08/2007.
Identifiers: 938127, BID-25310, CERTA-2007-AVI-361, CVE-2007-1749, MS07-050, VIGILANCE-VUL-7093, VU#468800.
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Description of the vulnerability

The VGX.DLL library displays VML (Vector Markup Language) objects in Internet Explorer.

A malicious VML object can create an overflow in the OnDataAvailable() method of CDownloadSink class of VGX.DLL. This overflow leads to code execution.

An attacker can therefore for example create a malicious HTML document using VML in order to execute code on computer of victim.
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computer threat announce CVE-2007-3032 CVE-2007-3033 CVE-2007-3891

Windows Vista: vulnerabilities of Gadget

Synthesis of the vulnerability

Three vulnerabilities affect Feed, Contacts and Weather Gadgets.
Severity: 3/4.
Number of vulnerabilities in this bulletin: 3.
Creation date: 16/08/2007.
Revision date: 14/09/2007.
Identifiers: 938123, BID-25287, BID-25304, BID-25306, CERTA-2007-AVI-359, CVE-2007-3032, CVE-2007-3033, CVE-2007-3891, MS07-048, VIGILANCE-VUL-7092, VU#121024, VU#542808, VU#558648.
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Description of the vulnerability

Three vulnerabilities affect Gadgets of Windows Vista.

When victim subscribed to a malicious RSS feed via Feed Headlines Gadget, this feed can provide an attribute containing JavaScript code leading to code execution. [severity:3/4; BID-25287, CVE-2007-3033, VU#558648]

When victim imports a malicious contact in Contacts Gadget, code can be executed. [severity:3/4; BID-25304, CERTA-2007-AVI-359, CVE-2007-3032, VU#121024]

When victim clicks on a malicious link in Weather Gadget, attacker can provide a malicious attribute leading to code execution. [severity:3/4; BID-25306, CVE-2007-3891, VU#542808]
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vulnerability bulletin CVE-2007-3035 CVE-2007-3037

Windows Media Player: code execution via skins

Synthesis of the vulnerability

An attacker can create a malformed skin in order to execute code on computer of victims opening it with Windows Media Player.
Severity: 3/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 16/08/2007.
Identifiers: BID-25305, BID-25307, CERTA-2007-AVI-358, CVE-2007-3035, CVE-2007-3037, MS07-047, VIGILANCE-VUL-7091, ZDI-07-046, ZDI-07-047.
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Description of the vulnerability

Skins of Windows Media Player define its appearance (WMZ and WMD extension). Two vulnerabilities can be exploited via malicious skins.

A skin with a malformed header generates a memory corruption. [severity:3/4; BID-25305, CVE-2007-3037, ZDI-07-046]

A skin with a malicious compression generates a memory corruption. [severity:3/4; BID-25307, CERTA-2007-AVI-358, CVE-2007-3035, ZDI-07-047]

An attacker can therefore create a skin to execute code on computer of victims opening it with Windows Media Player.
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computer weakness alert CVE-2007-3034

Windows: overflow of GDI

Synthesis of the vulnerability

An attacker can create a malicious image leading to code execution in GDI.
Severity: 4/4.
Creation date: 16/08/2007.
Identifiers: BID-25302, CERTA-2007-AVI-357, CVE-2007-3034, MS07-046, VIGILANCE-VUL-7090, VU#640136.
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Description of the vulnerability

The GDI interface (Graphics Device Interface) permits applications to display and print text and graphics.

An overflow can occur in the AttemptWrite() function of GDI when a malicious Metafile image is displayed.

An attacker can therefore create a malicious image, then for example send it to victim, in order to execute code on his computer.
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