Ubuntu.comUB:CVE-2019-18805CVE-2019-18805
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.007 Low
EPSS
Percentile
80.0%
An issue was discovered in net/ipv4/sysctl_net_ipv4.c in the Linux kernel
before 5.0.11. There is a net/ipv4/tcp_input.c signed integer overflow in
tcp_ack_update_rtt() when userspace writes a very large integer to
/proc/sys/net/ipv4/tcp_min_rtt_wlen, leading to a denial of service or
possibly unspecified other impact, aka CID-19fad20d15a6.
Notes
| Author | Note |
|---|---|
| sbeattie | requires write access to /proc/sys/net/ipv4/tcp_min_rtt_wlen … which is probably possible with unprivileged user namespaces; Marking when this sysctl was added as the break line |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | linux | < 4.15.0-60.67 | UNKNOWN |
| ubuntu | 19.04 | noarch | linux | < 5.0.0-21.22 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux | < 4.4.0-157.185 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws | < 4.15.0-1047.49 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-aws | < 4.4.0-1054.58) Available with Ubuntu Pro or Ubuntu Pro (Infra-only | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-aws | < 4.4.0-1090.101 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-aws-hwe | < 4.15.0-1047.49~16.04.1 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-azure | < 5.0.0-1014.14~18.04.1 | UNKNOWN |
| ubuntu | 19.04 | noarch | linux-azure | < 5.0.0-1012.12 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-azure | < 4.15.0-1059.64~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only | UNKNOWN |
References
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.11
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19fad20d15a6494f47f85d869f00b11343ee5c78
launchpad.net/bugs/cve/CVE-2019-18805
nvd.nist.gov/vuln/detail/CVE-2019-18805
security-tracker.debian.org/tracker/CVE-2019-18805
www.cve.org/CVERecord?id=CVE-2019-18805
Related
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.007 Low
EPSS
Percentile
80.0%