xdm Xsession symlink
| xdm-xsession-symlink (29427) |  Medium Risk |
Description:
X Display Manager (xdm) could allow a local attacker to launch a symlink attack. The /tmp/xses-$USER files are created insecurely. A local attacker could exploit this vulnerability to create or overwrite arbitrary files on the system or view another user's Xsession error logs to obtain sensitive information.
*CVSS:
| Base Score: | 2.6 |
| Access Vector: | Local |
| Access Complexity: | High |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | Partial |
| Availability Impact: | Partial |
| Temporal Score: | 2.3 |
| Exploitability: | High |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
File Manipulation
Remedy:
For NetBSD:
Upgrade to the latest version of Xsession, available from the NetBSD CVS Repository. See References.
For X.Org X Server:
Upgrade to the latest version of X.Org Xsession (dated 20060225 or later), or apply the appropriate patch for your system, available from the X.Org Foundation Web site. See References.
For Sun Solaris:
Refer to Sun Alert ID: 102652 for patch, upgrade, or suggested workaround information. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
References:
- NetBSD CVS Repository: NetBSD CVS Repository.
- Sun Alert ID: 102652: Security Vulnerability in X Display Manager (xdm(1)) Xsession Script.
- X.Org Foundation Web site: X.Org Foundation.
- ASA-2006-250: Sun Alert Notifications from Sun Weekly Report dated October 07 2006
- CVE-2006-5215: The Xsession script, as used by X Display Manager (xdm) in NetBSD before 20060212, X.Org before 20060317, and Solaris 8 through 10 before 20061006, allows local users to overwrite arbitrary files, or read another user's Xsession errors file, via a symlink attack on a /tmp/xses-$USER file.
- SA22992: Avaya CMS Sun Solaris X Display Manager Security Issue
- SECTRACK ID: 1017015: Xdm May Let Local Users View the Error Log Files of a Target User
Platforms Affected:
- NetBSD NetBSD 3.0
- Sun Solaris 10
- Sun Solaris 8
- Sun Solaris 9
- X.Org X.Org Server
- XFree86 xdm
Reported:
Oct 06, 2006
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.