Ubuntu.comUB:CVE-2019-15847CVE-2019-15847
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
0.002 Low
EPSS
Percentile
54.6%
The POWER9 backend in GNU Compiler Collection (GCC) before version 10 could
optimize multiple calls of the __builtin_darn intrinsic into a single call,
thus reducing the entropy of the random number generator. This occurred
because a volatile operation was not specified. For example, within a
single execution of a program, the output of every __builtin_darn() call
may be the same.
Bugs
Notes
| Author | Note |
|---|---|
| mdeslaur | this is part of the power9 ISA, and Ubuntu binaries are built with the power8 ISA, so no binaries in the archive are affected setting priority to negligible |
| eslerm | instruction set implementation for POWER9 began in gcc-6 affected darn instruction set implemented on 2016-06-02 which predates gcc-6.1.0 |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 20.04 | noarch | gcc-10 | < 10.2.0-5ubuntu1~20.04 | UNKNOWN |
| ubuntu | 18.04 | noarch | gcc-6 | < any | UNKNOWN |
| ubuntu | 18.04 | noarch | gcc-6-cross | < any | UNKNOWN |
| ubuntu | 18.04 | noarch | gcc-6-cross-ports | < any | UNKNOWN |
| ubuntu | 18.04 | noarch | gcc-7 | < 7.5.0-3ubuntu1~18.04 | UNKNOWN |
| ubuntu | 19.10 | noarch | gcc-7 | < 7.4.0-12ubuntu2 | UNKNOWN |
| ubuntu | 18.04 | noarch | gcc-7-cross | < any | UNKNOWN |
| ubuntu | 18.04 | noarch | gcc-7-cross-ports | < any | UNKNOWN |
| ubuntu | 18.04 | noarch | gcc-8 | < 8.3.0-26ubuntu1~18.04 | UNKNOWN |
| ubuntu | 18.04 | noarch | gcc-8-cross | < any | UNKNOWN |
References
gcc.gnu.org/git/?p=gcc.git;a=commit;h=457dac402027dd7e14543fbd59a75858422cf6c6
gcc.gnu.org/git/?p=gcc.git;a=commit;h=e99bfdd2a8db732ea84cf0a6486707e5e821ad7e
launchpad.net/bugs/cve/CVE-2019-15847
nvd.nist.gov/vuln/detail/CVE-2019-15847
security-tracker.debian.org/tracker/CVE-2019-15847
www.cve.org/CVERecord?id=CVE-2019-15847
Related
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:N/A:N
0.002 Low
EPSS
Percentile
54.6%