Remote code execution in Linux kernel TCP/IP implementation

Published: 2019-05-13 | Updated: 2019-05-13
Severity High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-11815
CWE ID CWE-416
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software Linux kernel Subscribe
Vendor Linux Foundation

Security Advisory

This security advisory describes one high risk vulnerability.

1) Use-after-free

Severity: High

CVSSv3: 8.8 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-11815

CWE-ID: CWE-416 - Use After Free

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a race condition that leads to use-after-free error when TCP packets in rds_tcp_kill_sock() function in net/rds/tcp.c. A remote unauthenticated attacker can specially crafted TCP packets to the affected system, trigger use-after-free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.0, 5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7

CPE External links

http://www.securityfocus.com/bid/108283
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.8
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cb66ddd156203daefb8d71158036b27b0e2caf63
https://github.com/torvalds/linux/commit/cb66ddd156203daefb8d71158036b27b0e2caf63

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.