Linux-PAM pam_unix.so security bypass
| linuxpam-pamunix-security-bypass (31739) |  Medium Risk |
Description:
Linux-PAM could allow a remote attacker to bypass security restrictions, caused by a vulnerability in pam_unix.so when handling password hashes that consist of two characters. An attacker could exploit this vulnerability to bypass security restrictions and gain unauthorized access to the system using arbitrary accounts.
*CVSS:
| Base Score: | 3.5 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 2.6 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Gain Access
Remedy:
Upgrade to the latest version of Linux-PAM (0.99.7.1 or later), available from the Linux-PAM Web page. See References.
References:
- Linux-PAM Web site: pam/Linux-PAM.
- pam-list Mailing List, Tue, 23 Jan 2007 14:35:31 +0100: Linux-PAM 0.99.7.1 released.
- BID-22204: Linux-PAM Pam_Unix.SO Authentication Bypass Vulnerability
- CVE-2007-0003: pam_unix.so in Linux-PAM 0.99.7.0 allows context-dependent attackers to log into accounts whose password hash, as stored in /etc/passwd or /etc/shadow, has only two characters.
- SA23858: Linux-PAM Login Bypass Security Vulnerability
- SUSE-SR:2007:003: SUSE Security Summary Report
- VUPEN/ADV-2007-0323: Linux-PAM _unix_verify_password() Password Handling Security Bypass Vulnerability
Platforms Affected:
- Linux Linux-PAM 0.99.7.0
Reported:
Jan 23, 2007
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 the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email xforce@iss.net
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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.