7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
42.9%
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.
Author | Note |
---|---|
sbeattie | This issue appears to only affect bash when bash is setuid. Ubuntu does not ship with bash setuid, so this has minimal impact for Ubuntu users. This is why we have rated the priority for this issue ‘low’. reproducer steps in the suse bugzilla |
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | bash | < 4.4.18-2ubuntu1.3 | UNKNOWN |
ubuntu | 20.04 | noarch | bash | < 5.0-6ubuntu1.2 | UNKNOWN |
ubuntu | 14.04 | noarch | bash | < 4.3-7ubuntu1.8+esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-only | UNKNOWN |
ubuntu | 16.04 | noarch | bash | < 4.3-14ubuntu1.4+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only | UNKNOWN |
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.001 Low
EPSS
Percentile
42.9%