security advisorydebiansymlink attack
New fsh packages exist to fix potential symlink attack vulnerabilities.. -----BEGIN PGP SIGNED MESSAGE----- - ------------------------------------------------------------------------ Debian Security Advisory DSA-002-1 This email address is being protected from spambots. You need JavaScript enabled to view it. Debian -- Security Information Wichert Akkerman November 30, 2000 - ------------------------------------------------------------------------ Package : fsh Problem type : symlink attack Debian-specific: no Colin Phipps found an interesting symlink attack problem in fsh (a tool to quickly run remote commands over rsh/ssh/lsh). When fshd starts it creates a directory in /tmp to hold its sockets. It tries to do that securely by checking of it can chown that directory if it already exists to check if it is owner by the user invoking it. However an attacker can circumvent this check by inserting a symlink to a file that is owner by the user who runs fhsd and replacing that with a directory just before fshd creates the socket. This has been fixed in version 1.0.post.1-3potato. wget url will fetch the file for you dpkg -i file.deb will install the referenced file. Debian GNU/Linux 2.2 alias potato - --------------------------------- Potato was released for alpha, arm, i386, m68k, powerpc and sparc. Source archives: MD5 checksum: 278a82a3899974ec60b4f92d3a2d53d7 MD5 checksum: d2e6eee08ba39ed82b756f39da2a1587 MD5 checksum: d0ade4d65da92256c110a042479109f1 Alpha architecture: MD5 checksum: 729414dcde81ef4d50681839a8df62a2 ARM architecture: MD5 checksum: 5543a9a61b7af9b48c277f4aca83c75a Intel ia32 architecture: MD5 checksum: 6d6dd446e87bff6ed57c7176813609c8 Motorola 680x0 architecture: MD5 checksum: 50bce3a431b141e68a3dfdae1b71f5a9 PowerPC architecture: MD5 checksum: 8e99a4a3657fee8d9545099d02526c5b Sun Sparc architecture: MD5 checksum:fe3de98286cb7d5e83ca00631785adbe These files will be moved into soon. For not yet released architectures please refer to the appropriate directory . - -- - ---------------------------------------------------------------------------- apt-get: deb Debian -- Security Information stable/updates main dpkg-ftp: dists/stable/updates/main Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it. -----BEGIN PGP SIGNATURE----- Version: 2.6.3ia Charset: noconv iQB1AwUBOiWVL6jZR/ntlUftAQHOswL+K5a0D9jC0wiUZNqpW0ypiQuf4MzkHtgJ 8SO+Bm9hyF5BJgyLnsA8ZKchkF1nAlTMZP0iighUcD0+7C4aVtrtFjtXAc48tK1O bbdyGgROIDB0ONzIm+dYckBQwbNsd1pa =aRkV -----END PGP SIGNATURE----- . Addressing a critical symlink attack threat in fsh with a patch to mitigate remote execution risks in Debian.. Debian Advisory,fsh fix,symlink threat,remote execution risk. . Severity: Critical. LinuxSecurity.com Team
Nov 29, 2000
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