zsh up to 5.4.1 Autocomplete memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.9$0-$5k0.00

Summaryinfo

A vulnerability was found in zsh up to 5.4.1. It has been rated as critical. The affected element is an unknown function of the component Autocomplete Handler. Performing a manipulation results in memory corruption. This vulnerability was named CVE-2018-1083. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in zsh up to 5.4.1. It has been classified as critical. This affects an unknown function of the component Autocomplete Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Zsh before version 5.4.2-test-1 is vulnerable to a buffer overflow in the shell autocomplete functionality. A local unprivileged user can create a specially crafted directory path which leads to code execution in the context of the user who tries to use autocomplete to traverse the before mentioned path. If the user affected is privileged, this leads to privilege escalation.

The bug was discovered 03/16/2018. The weakness was presented 03/28/2018 as Bug 1557382 as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2018-1083 since 12/04/2017. It is possible to initiate the attack remotely. The successful exploitation requires a authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 12 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 108769 (Debian DLA-1335-1 : zsh security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157839 (Oracle Enterprise Linux Security Update for zsh (ELSA-2018-3073)).

Upgrading to version 5.4.2-test-1 eliminates this vulnerability. A possible mitigation has been published 3 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (108769) and SecurityFocus (BID 103572†). See VDB-113890, VDB-113891, VDB-113902 and VDB-113903 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 108769
Nessus Name: Debian DLA-1335-1 : zsh security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 803175
OpenVAS Name: Debian LTS Advisory ([SECURITY] [DLA 1335-1] zsh security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: zsh 5.4.2-test-1
Patch: sourceforge.net

Timelineinfo

12/04/2017 🔍
03/16/2018 +102 days 🔍
03/24/2018 +8 days 🔍
03/28/2018 +4 days 🔍
03/28/2018 +0 days 🔍
03/28/2018 +0 days 🔍
03/31/2018 +3 days 🔍
04/02/2018 +2 days 🔍
02/24/2023 +1789 days 🔍

Sourcesinfo

Advisory: Bug 1557382
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-1083 (🔍)
GCVE (CVE): GCVE-0-2018-1083
GCVE (VulDB): GCVE-100-115143
SecurityFocus: 103572 - Zsh CVE-2018-1083 Local Stack Buffer Overflow Vulnerability

See also: 🔍

Entryinfo

Created: 03/28/2018 23:05
Updated: 02/24/2023 13:55
Changes: 03/28/2018 23:05 (77), 01/17/2020 15:28 (5), 02/24/2023 13:55 (4)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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