Debian LTS: DLA-2470-1: zsh security update
Summary
Several security vulnerabilities were found and corrected in zsh, a powerful
shell and scripting language. Off-by-one errors, wrong parsing of shebang lines
and buffer overflows may lead to unexpected behavior. A local, unprivileged
user can create a specially crafted message file or directory path. If the
receiving user is privileged or traverses the aforementioned path, this leads
to privilege escalation.
For Debian 9 stretch, these problems have been fixed in version
5.3.1-4+deb9u4.
We recommend that you upgrade your zsh packages.
For the detailed security status of zsh please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/zsh
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS