Debian update for linux

Published: 2019-07-20

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-13272 CVE-2019-11478
CWE-ID	CWE-264 CWE-400
Exploitation vector	Network
Public exploit	Vulnerability #1 is being exploited in the wild.
Vulnerable software Subscribe	linux (Debian package) Operating systems & Components / Operating system package or component
Vendor	Debian

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU19284

Risk: Low

CVSSv3.1: 7.5 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2019-13272

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: Yes

Description

The vulnerability allows a local user to perform unauthorized actions on a targeted system.

The vulnerability exists when recording the credentials of a process that will create a ptrace relationship in the "ptrace_link" function in the "kernel/ptrace.c" file. A local authenticated user can create a specially crafted application and escalate privileges on the system.

Mitigation

Update linux package to one of the following versions: 4.9.168-1+deb9u4, 4.19.37-5+deb10u1.

Vulnerable software versions

linux (Debian package): 4.9.168-1+deb9u2 - 4.9.168-1+deb9u3

External links

http://www.debian.org/security/2019/dsa-4484

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.

2) Resource exhaustion

EUVDB-ID: #VU18946

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11478

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to an error when processing TCP Selective Acknowledgment (SACK) sequences within the Linux kernel TCP retransmission queue implementation in tcp_fragment. A remote non-authenticated attacker can send specially crafted network traffic to the affected system and perform a denial of service (DoS) attack.

Mitigation

Update linux package to one of the following versions: 4.9.168-1+deb9u4, 4.19.37-5+deb10u1.

Vulnerable software versions

linux (Debian package): 4.9.168-1+deb9u2 - 4.9.168-1+deb9u3

External links

http://www.debian.org/security/2019/dsa-4484

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.