Exploitalert - Database of Exploits

Rosiello Security - Eterm-LibAST Advisory

CVE	Category	Price	Severity
CVE-2006-0224	CWE-121	$10,000	High

Author	Risk	Exploitation Type	Date
Rosiello Security	High	Local	2006-01-28

CVSS	EPSS	EPSSP
CVSS:4.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity	High	AC	The successful attack depends on the evasion or circumvention of security-enhancing techniques in place that would otherwise hinder the attack. These include: Evasion of exploit mitigation techniques. The attacker must have additional methods available to bypass security measures in place. For example, circumvention of address space randomization (ASLR) or data execution prevention must be performed for the attack to be successful. Obtaining target-specific secrets. The attacker must gather some target-specific secret before the attack can be successful. A secret is any piece of information that cannot be obtained through any amount of reconnaissance. To obtain the secret the attacker must perform additional attacks or break otherwise secure measures (e.g. knowledge of a secret key may be needed to break a crypto channel). This operation must be performed for each attacked target.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

http://cxsecurity.com/ascii/WLB-2006010060

Eterm-LibAST Advisory Rosiello Security http://www.rosiello.org I. BACKGROUND Eterm (http://www.eterm.org) is a color vt102 terminal emulator intended as an xterm(1) replacement. It is designed with a Freedom of Choice philosophy, leaving as much power, flexibility, and freedom as possible in the hands of the user. It is designed to look good and work well, but takes a feature-rich approach rather than one of minimalism. Eterm uses Imlib for advanced graphic abilities and includes LibAST. II. DESCRIPTION Eterm when builded links to LibAST. A stack overflow vulnerability exists in LibAST that allows an attacker to execute commands with user group ?utmp?. The vulnerability is triggered when using an alternative configuration file name by the '-X' option. In this case Eterm will call conf_find_file() in conf.c from LibAST. Here is where vulnerability takes place at: if (dir) { strcpy(name, dir); strcat(name, "/"); strcat(name, file); } III. ANALISYS By exploiting this vulnerability an attacker can gain control of the return address of the executing function allowing arbitrary code execution with "utmp" group privileges. IV. DETECTION All vulnerable versions of Eterm using LibAST prior to 0.7 are vulnerable. V. WORKAROUND Rosiello Security is currently unaware of any workaround for this issue. VI. VENDOR RESPONSE The vendor has released the following new package of LibAST to fix the problem: http://www.eterm.org/download/libast-0.7.tar.gz VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-0224 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 15/01/2006 - Initial Vendor Contact 16/01/2006 ? Initial Vendor Response 23/01/2006 ? Coordinated public disclosure IX. CREDITS Johnny Mast from Rosiello Security (http://www.rosiello.org) is credited with discovering this vulnerability. Rosiello Security home page: http://www.rosiello.org You can find Rosiello Security's members in our irc server: irc.rosiello.net #rosiello Visit our latest project Obsidis where you can find free security white papers: http://www.obsidis.org X. LEGAL NOTICES Copyright © 2006 Rosiello Security Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of Rosiello Security. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email angelo (at) rosiello (dot) org [email concealed] for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. Exploit: http://www.rosiello.org/archivio/eterm-exploit.c (Ubuntu with no random stack)

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