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Red Hat 6 RHSA-2018:1932-01 Moderate: Zsh Buffer Overflow Risks

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Calendar Grey June 19, 2018
Scroller Redhat
Explore the recent zsh security patch for Red Hat that includes essential remedies for several critical buffer overflow vulnerabilities.
An update for zsh is now available for Red Hat Enterprise Linux 6

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Summary

The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more.
Security Fix(es):
* zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083)
* zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072)
* zsh: buffer overrun in symlinks (CVE-2017-18206)
* zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100)
For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.
The CVE-2018-1083 and CVE-2018-1100 issues were discovered by Richard Maciel Costa (Red Hat).
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.10 Release Notes and Red Hat Enterprise Linux 6.10 Technical Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory security update Red Hat buffer overflow moderate severity zsh command interpreter

References

https://access.redhat.com/security/cve/CVE-2014-10072 https://access.redhat.com/security/cve/CVE-2017-18206 https://access.redhat.com/security/cve/CVE-2018-1083 https://access.redhat.com/security/cve/CVE-2018-1100 https://access.redhat.com/security/updates/classification#moderate https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/6.10_release_notes/index.html https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/6/html/6.10_technical_notes/index.html

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: zsh-4.3.11-8.el6.src.rpm
i386: zsh-4.3.11-8.el6.i686.rpm zsh-debuginfo-4.3.11-8.el6.i686.rpm
x86_64: zsh-4.3.11-8.el6.x86_64.rpm zsh-debuginfo-4.3.11-8.el6.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: zsh-debuginfo-4.3.11-8.el6.i686.rpm zsh-html-4.3.11-8.el6.i686.rpm
x86_64: zsh-debuginfo-4.3.11-8.el6.x86_64.rpm zsh-html-4.3.11-8.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: zsh-4.3.11-8.el6.src.rpm
x86_64: zsh-4.3.11-8.el6.x86_64.rpm zsh-debuginfo-4.3.11-8.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64: zsh-debuginfo-4.3.11-8.el6.x86_64.rpm zsh-html-4.3.11-8.el6.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source: zsh-4.3.11-8.el6.src.rpm
i386: zsh-4.3.11-8.el6.i686.rpm zsh-debuginfo-4.3.11-8.el6.i686.rpm
ppc64: zsh-4.3.11-8.el6.ppc64.rpm zsh-debuginfo-4.3.11-8.el6.ppc64.rpm
s390x: zsh-4.3.11-8.el6.s390x.rpm zsh-debuginfo-4.3.11-8.el6.s390x.rpm
x86_64: zsh-4.3.11-8.el6.x86_64.rpm zsh-debuginfo-4.3.11-8.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
i386: zsh-debuginfo-4.3.11-8.el6.i686.rpm zsh-html-4.3.11-8.el6.i686.rpm
ppc64: zsh-debuginfo-4.3.11-8.el6.ppc64.rpm zsh-html-4.3.11-8.el6.ppc64.rpm
s390x: zsh-debuginfo-4.3.11-8.el6.s390x.rpm

Read the Full Advisory


Advisory ID: RHSA-2018:1932-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1932
Issue date: 2018-06-19

Topic

An update for zsh is now available for Red Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security update Red Hat buffer overflow moderate severity zsh command interpreter

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

Bugs Fixed

1549836 - CVE-2014-10072 zsh: buffer overflow when scanning very long directory paths for symbolic links

1549861 - CVE-2017-18206 zsh: buffer overrun in symlinks

1557382 - CVE-2018-1083 zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c

1563395 - CVE-2018-1100 zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution

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