Ubuntu.comUB:CVE-2017-9445CVE-2017-9445
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.528 Medium
EPSS
Percentile
97.6%
In systemd through 233, certain sizes passed to dns_packet_new in
systemd-resolved can cause it to allocate a buffer that’s too small. A
malicious DNS server can exploit this via a response with a specially
crafted TCP payload to trick systemd-resolved into allocating a buffer
that’s too small, and subsequently write arbitrary data beyond the end of
it.
Bugs
Notes
| Author | Note |
|---|---|
| chrisccoulson | I believe this was introduced in v223 by https://github.com/systemd/systemd/commit/a0166609f782da91710dea9183d1bf138538db37 systemd-resolved is not used by default in Xenial. It is spawned if a user execs the systemd-resolve utility, but that shouldn’t impact the system. |
Related
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.528 Medium
EPSS
Percentile
97.6%