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CVE-2019-18276

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-5380-1
Posted Apr 20, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5380-1 - It was discovered that Bash did not properly drop privileges when the binary had the setuid bit enabled. An attacker could possibly use this issue to escalate privileges.

tags | advisory, bash
systems | linux, ubuntu
advisories | CVE-2019-18276
SHA-256 | 173a734aa620d03a2270533a7ff0022b9fb8a72908396d8604869220c0c5934d
Gentoo Linux Security Advisory 202105-34
Posted May 26, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202105-34 - A vulnerability in Bash may allow users to escalate privileges. Versions less than 5.0_p11-r1 are affected.

tags | advisory, bash
systems | linux, gentoo
advisories | CVE-2019-18276
SHA-256 | d14b7a6c79dcafc423e08f9754342a9daaccb7c5435a66a2f26302075f56dfe8
Red Hat Security Advisory 2021-1679-01
Posted May 19, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-1679-01 - The bash packages provide Bash, which is the default shell for Red Hat Enterprise Linux.

tags | advisory, shell, bash
systems | linux, redhat
advisories | CVE-2019-18276
SHA-256 | bedd180f89519978a938efa7386b96d2a29ca03aa105a237c7520eed9b71134e
Bash 5.0 Patch 11 Privilege Escalation
Posted Nov 29, 2019
Authored by Mohin Paramasivam, Chet Ramey, Ian Pudney

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.

tags | exploit, shell, bash
systems | linux
advisories | CVE-2019-18276
SHA-256 | 506feee71f53fac76413f6d8f5b4cad88bddee539003ffcdf0c54f19b9a741ec
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