HOMEVULNERABILITIESCVE-2019-18276
HIGH

CVE-2019-18276

CWE-273Published: November 28, 2019· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-18276 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

gnu1 product(s)
bash
netapp3 product(s)
hci management nodeoncommand unified managersolidfire
Oracle1 product(s)
communications cloud native core policy
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
PATCHhttps://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
ADVISORYhttp://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html
ADVISORYhttps://security.gentoo.org/glsa/202105-34
ADVISORYhttps://security.netapp.com/advisory/ntap-20200430-0003/
ADVISORYhttps://www.youtube.com/watch?v=-wGtxJ8opa8
ADVISORYhttp://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html
ADVISORYhttps://security.gentoo.org/glsa/202105-34
ADVISORYhttps://security.netapp.com/advisory/ntap-20200430-0003/
ADVISORYhttps://www.youtube.com/watch?v=-wGtxJ8opa8

All References (14)

→
http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.htmlExploit · Third Party Advisory · VDB Entry
→
https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ffPatch · Third Party Advisory
→
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
→
https://security.gentoo.org/glsa/202105-34Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20200430-0003/Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch · Third Party Advisory
→
https://www.youtube.com/watch?v=-wGtxJ8opa8Exploit · Third Party Advisory
→
http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.htmlExploit · Third Party Advisory · VDB Entry
→
https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ffPatch · Third Party Advisory
→
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
→
https://security.gentoo.org/glsa/202105-34Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20200430-0003/Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch · Third Party Advisory
→
https://www.youtube.com/watch?v=-wGtxJ8opa8Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2019-18276
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-273
CISA KEVNo
Affected3 vendor(s)
PublishedNov 28, 2019

Related CVEs (CWE-273)

CVE-2015-0278
10.0
CVE-2017-6972
9.8
CVE-2011-2921
9.8
CVE-2020-24361
9.8
CVE-2021-36372
9.8
CVE-2012-1187
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-18276 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2019-18276·NVD