LSH file descriptor leak information disclosure and denial of service
|lsh-file-descriptor-leak (24263)||Medium Risk|
LSH leaks file descriptors of the random generator seed file to user shells that are started by lshd. This could allow a local attacker to cause a denial of service by truncating the seed file, or obtain sensitive information that could be used to crack session keys.
For vendor-supplied patch, refer to the lsh-bugs Mailing List posting dated Fri Jan 20 17:44:07 CET 2006. See References.
For Debian GNU/Linux:
Refer to DSA-956-1 for patch, upgrade, or suggested workaround information. See References.
- lsh Web page: LSH - a GNU implementation of the Secure Shells protocols.
- lsh-bugs Mailing List, Fri Jan 20 17:44:07 CET 2006: SECURITY: lshd leaks fd:s to user shells.
- BID-16357: LSH Seed File File Descriptor Leakage Vulnerability
- CVE-2006-0353: unix_random.c in lshd for lsh 2.0.1 leaks file descriptors related to the randomness generator, which allows local users to cause a denial of service by truncating the seed file, which prevents the server from starting, or obtain sensitive seed information that could be used to crack keys.
- DSA-956: lsh-server -- filedescriptor leak
- OSVDB ID: 22695: LSH lshd Seed-file File Descriptor Leak
- SA18564: LSH lshd Seed-file File Descriptor Leak Vulnerability
- Debian Debian Linux 3.1
- GNU LSH 2.0.1
Jan 20, 2006
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