CVE-2019-18276

Common vulnerabilities & exposures (CVE)

CVE database CVE database blogpost Release & EoL database

Published at: - 28-11-2019 02:15

Last modified: - 07-06-2022 08:41

Total changes: - 6

Description

An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly. On Linux and other systems that support "saved UID" functionality, the saved UID is not dropped. An attacker with command execution in the shell can use "enable -f" for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Low

Attack complexity

Local

Attack vector

High

Availability

High

Confidentiality

High

Integrity

Low

Privileges required

Unchanged

Scope

None

User interaction

7.8

Base score

1.8

5.9

Exploitability score

Impact score

Verification logic

vendor=gnu AND product=bash AND versionEndIncluding=5.0

vendor=gnu AND product=bash AND version=5.0 AND update=patch1

vendor=gnu AND product=bash AND version=5.0 AND update=patch2

vendor=gnu AND product=bash AND version=5.0 AND update=patch3

vendor=gnu AND product=bash AND version=5.0 AND update=patch4

vendor=gnu AND product=bash AND version=5.0 AND update=patch5

vendor=gnu AND product=bash AND version=5.0 AND update=patch6

vendor=gnu AND product=bash AND version=5.0 AND update=patch7

vendor=gnu AND product=bash AND version=5.0 AND update=patch8

vendor=gnu AND product=bash AND version=5.0 AND update=patch9

vendor=gnu AND product=bash AND version=5.0 AND update=patch10

vendor=gnu AND product=bash AND version=5.0 AND update=patch11

vendor=gnu AND product=bash AND version=5.0 AND update=beta1

vendor=gnu AND product=bash AND version=5.0 AND update=beta2

vendor=gnu AND product=bash AND version=5.0 AND update=rc1

vendor=netapp AND product=solidfire AND version=-

vendor=netapp AND product=hci_management_node AND version=-

vendor=netapp AND product=oncommand_unified_manager AND target_software=vmware_vsphere AND versionStartIncluding=9.5

vendor=oracle AND product=communications_cloud_native_core_policy AND version=1.14.0

Reference

Keywords

CVE-2019-18276

Common vulnerabilities & exposures (CVE)

Description

Common Vulnerability Scoring System (CVSS)

Verification logic

Reference

NVD

CVE-2019-18276

CVE

Common vulnerabilities & exposures

CVSS

Common vulnerability scoring system

Security

Vulnerabilities

Exposures