Debian Security Advisory

DLA-2470-1 zsh -- LTS security update

Date Reported:
01 Dec 2020
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 908000, Bug 894044, Bug 894043, Bug 895225, Bug 951458.
In Mitre's CVE dictionary: CVE-2017-18206, CVE-2018-0502, CVE-2018-1071, CVE-2018-1083, CVE-2018-1100, CVE-2018-13259, CVE-2019-20044.
More information:

CVE-2018-1100 CVE-2018-13259 CVE-2019-20044 Debian Bug : 908000 894044 894043 895225 951458

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:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: