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Red Hat 7: RHSA-2018-3073 Moderate zsh Buffer Overflow Threat

red hat
Calendar Grey October 30, 2018
Dist Redhat Esm H88
A noteworthy zsh patch for Red Hat Enterprise Linux 7 brings essential enhancements and protective actions.
An update for zsh is now available for Red Hat Enterprise Linux 7

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 for very long fds in >& fd syntax (CVE-2014-10071)
* zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072)
* zsh: NULL dereference in cd in sh compatibility mode under given circumstances (CVE-2017-18205)
* zsh: buffer overrun in symlinks (CVE-2017-18206)
* zsh: Stack-based buffer overflow in exec.c:hashcmd() (CVE-2018-1071)
* zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100)
* zsh: crash on copying empty hash table (CVE-2018-7549)
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, CVE-2018-1071, 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 7.6 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory buffer overrun security fix Red Hat Enterprise Linux stack overflow zsh command interpreter

References

https://access.redhat.com/security/cve/CVE-2014-10071 https://access.redhat.com/security/cve/CVE-2014-10072 https://access.redhat.com/security/cve/CVE-2017-18205 https://access.redhat.com/security/cve/CVE-2017-18206 https://access.redhat.com/security/cve/CVE-2018-1071 https://access.redhat.com/security/cve/CVE-2018-1083 https://access.redhat.com/security/cve/CVE-2018-1100 https://access.redhat.com/security/cve/CVE-2018-7549 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.6_release_notes/index

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: zsh-5.0.2-31.el7.src.rpm
x86_64: zsh-5.0.2-31.el7.x86_64.rpm zsh-debuginfo-5.0.2-31.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: zsh-debuginfo-5.0.2-31.el7.x86_64.rpm zsh-html-5.0.2-31.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: zsh-5.0.2-31.el7.src.rpm
x86_64: zsh-5.0.2-31.el7.x86_64.rpm zsh-debuginfo-5.0.2-31.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: zsh-debuginfo-5.0.2-31.el7.x86_64.rpm zsh-html-5.0.2-31.el7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: zsh-5.0.2-31.el7.src.rpm
ppc64: zsh-5.0.2-31.el7.ppc64.rpm zsh-debuginfo-5.0.2-31.el7.ppc64.rpm
ppc64le: zsh-5.0.2-31.el7.ppc64le.rpm zsh-debuginfo-5.0.2-31.el7.ppc64le.rpm
s390x: zsh-5.0.2-31.el7.s390x.rpm zsh-debuginfo-5.0.2-31.el7.s390x.rpm
x86_64: zsh-5.0.2-31.el7.x86_64.rpm zsh-debuginfo-5.0.2-31.el7.x86_64.rpm
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):
Source: zsh-5.0.2-31.el7.src.rpm
aarch64: zsh-5.0.2-31.el7.aarch64.rpm zsh-debuginfo-5.0.2-31.el7.aarch64.rpm
ppc64le: zsh-5.0.2-31.el7.ppc64le.rpm zsh-debuginfo-5.0.2-31.el7.ppc64le.rpm
s390x: zsh-5.0.2-31.el7.s390x.rpm zsh-debuginfo-5.0.2-31.el7.s390x.rpm


Read the Full Advisory


Advisory ID: RHSA-2018:3073-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:3073
Issue date: 2018-10-30

Topic

An update for zsh is now available for Red Hat Enterprise Linux 7.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 buffer overrun security fix Red Hat Enterprise Linux stack overflow zsh command interpreter

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, ppc64le, s390x

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, ppc64le, s390x

Bugs Fixed

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

1549855 - CVE-2014-10071 zsh: buffer overflow for very long fds in >& fd syntax

1549858 - CVE-2018-7549 zsh: crash on copying empty hash table

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

1549862 - CVE-2017-18205 zsh: NULL dereference in cd in sh compatibility mode under given circumstances

1553531 - CVE-2018-1071 zsh: Stack-based buffer overflow in exec.c:hashcmd()

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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