Multiple vulnerabilities in Systemd

Published: 2018-10-29 11:23:08 | Updated: 2018-11-01 13:15:53
Severity High
Patch available YES
Number of vulnerabilities 3
CVE ID CVE-2018-15688
CVE-2018-15686
CVE-2018-15687
CVSSv3 8.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
8.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
6.4 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
CWE ID CWE-787
CWE-264
CWE-362
Exploitation vector Network
Public exploit Not available
Vulnerable software systemd
Vulnerable software versions systemd -
systemd v239
systemd v237
Show more
Vendor URL Freedesktop.org

Security Advisory

1) Heap out-of-bounds write

Description

The vulnerability allows a remote attacker to cause DoS condition or execute arbitrary code with elevated privileges.

The weakness exists within the written-from-scratch DHCPv6 client of the open-source Systemd management suite due to an out-of-bounds heap write in the DHCPv6 client when handling options sent by network adjacent DHCP servers. A remote attacker can supply maliciously crafted DHCPv6 packets, exploit the programming cockup, arbitrarily change parts of memory to crash or execute arbitrary code on the vulnerable Systemd-powered Linux machines.

Remediation

Install update from vendor's website.

External links

https://github.com/systemd/systemd/pull/10518

2) Privilege escalation

Description

The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The weakness exists due to an error in unit_deserialize of systemd. A remote attacker can supply arbitrary state across systemd re-execution via NotifyAccess and gain root privileges.

Remediation

Install update from vendor's website.

External links

https://github.com/systemd/systemd/pull/10519

3) Race condition

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to race condition in chown_one() of systemd. A remote attacker can bypass security restriction and set arbitrary permissions on arbitrary files.

Remediation

Install update from vendor's website.

External links

https://github.com/systemd/systemd/pull/10517/commits

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