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osvGoogleOSV:DLA-680-2
HistoryOct 26, 2016 - 12:00 a.m.

bash - version number correction

2016-10-2600:00:00
Google
osv.dev
12

8.4 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:N/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

49.8%

An old attack vector has been corrected in bash, a sh-compatible
command language interpreter.

  • CVE-2016-7543
    Specially crafted SHELLOPTS+PS4 environment variables in combination
    with insecure setuid binaries can result in root privilege
    escalation.

The setuid binary had to both use setuid() function call in
combination with a system() or popen() function call. With this
combination it is possible to gain root access.

I addition bash have to be the default shell (/bin/sh have to point
to bash) for the system to be vulnerable.

The default shell in Debian is dash and there are no known setuid
binaries in Debian with the, above described, insecure combination.

There could however be local software with the, above described,
insecure combination that could benefit from this correction.

For Debian 7 Wheezy, this problem have been fixed in version
4.2+dfsg-0.1+deb7u3.

We recommend that you upgrade your bash packages.

If there are local software that have the insecure combination and
do a setuid() to some other user than root, then the update will not
correct that problem. That problem have to be addressed in the
insecure setuid binary.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <https://wiki.debian.org/LTS&gt;

8.4 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:N/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

49.8%