Executive Summary
| Summary | |
|---|---|
| Title | New lsh-utils packages fix local vulnerabilities |
| Informations | |||
|---|---|---|---|
| Name | DSA-956 | First vendor Publication | 2006-01-26 |
| Vendor | Debian | Last vendor Modification | 2006-01-26 |
| Severity (Vendor) | N/A | Revision | 1 |
Security-Database Scoring CVSS v3
| Cvss vector : N/A | |||
|---|---|---|---|
| Overall CVSS Score | NA | ||
| Base Score | NA | Environmental Score | NA |
| impact SubScore | NA | Temporal Score | NA |
| Exploitabality Sub Score | NA | ||
| Calculate full CVSS 3.0 Vectors scores | |||
Security-Database Scoring CVSS v2
| Cvss vector : (AV:L/AC:L/Au:N/C:P/I:N/A:P) | |||
|---|---|---|---|
| Cvss Base Score | 3.6 | Attack Range | Local |
| Cvss Impact Score | 4.9 | Attack Complexity | Low |
| Cvss Expoit Score | 3.9 | Authentication | None Required |
| Calculate full CVSS 2.0 Vectors scores | |||
Detail
| Stefan Pfetzing discovered that lshd, a Secure Shell v2 (SSH2) protocol server, leaks a couple of file descriptors, related to the randomness generator, to user shells which are started by lshd. A local attacker can truncate the server's seed file, which may prevent the server from starting, and with some more effort, maybe also crack session keys. After applying this update, you should remove the server's seed file (/var/spool/lsh/yarrow-seed-file) and then regenerate it with "lsh-make-seed --server" as root. For security reasons, lsh-make-seed really needs to be run from the console of the system you are running it on. If you run lsh-make-seed using a remote shell, the timing information lsh-make-seed uses for its random seed creation is likely to be screwed. If need be, you can generate the random seed on a different system than that which it will eventually be on, by installing the lsh-utils package and running "lsh-make-seed -o my-other-server-seed-file". You may then transfer the seed to the destination system as using a secure connection. The old stable distribution (woody) may not be affected by this problem. For the stable distribution (sarge) this problem has been fixed in version 2.0.1-3sarge1. For the unstable distribution (sid) this problem has been fixed in version 2.0.1cdbs-4. We recommend that you upgrade your lsh-server package. |
Original Source
| Url : http://www.debian.org/security/2006/dsa-956 |
CWE : Common Weakness Enumeration
| % | Id | Name |
|---|---|---|
| 100 % | CWE-200 | Information Exposure |
CPE : Common Platform Enumeration
| Type | Description | Count |
|---|---|---|
| Application | 1 |
OpenVAS Exploits
| Date | Description |
|---|---|
| 2008-01-17 | Name : Debian Security Advisory DSA 956-1 (lsh-utils) File : nvt/deb_956_1.nasl |
Open Source Vulnerability Database (OSVDB)
| Id | Description |
|---|---|
| 22695 | LSH lshd Seed-file File Descriptor Leak LSH contains a flaw that may lead to an unauthorized information disclosure. The issue is triggered when LSH spawns a new shell for a user. This will leak file descriptors from the 'lshd' daemon to the new process, potentially allowing the user to obtain keying material from the random number generator seed file. This will result in a loss of confidentiality. In addition, the user could truncate that file, denying the 'lshd' daemon access to keying material, causing a Denial-of-Service condition. |
Nessus® Vulnerability Scanner
| Date | Description |
|---|---|
| 2006-10-14 | Name : The remote Debian host is missing a security-related update. File : debian_DSA-956.nasl - Type : ACT_GATHER_INFO |
Alert History
| Date | Informations |
|---|---|
| 2014-02-17 11:34:51 |
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