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.
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Affected Vendors & Products
References
History
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MITRE
Status: PUBLISHED
Assigner: mitre
Published: 2019-11-28T00:27:51
Updated: 2024-08-05T01:47:14.188Z
Reserved: 2019-10-23T00:00:00
Link: CVE-2019-18276
Vulnrichment
No data.
NVD
Status : Modified
Published: 2019-11-28T01:15:10.603
Modified: 2023-11-07T03:06:25.300
Link: CVE-2019-18276
Redhat