Fedora 28 update for kernel, kernel-headers, kernel-tools

1) Use-after-free

EUVDB-ID: #VU17804

Risk: Low

CVSSv4.0: 5.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2019-8912

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to the af_alg_release() function, as defined in the crypto/af_alg.c source code file of the affected software, fails to set a NULL value for a certain structure member. A local attacker can access the system and execute an application that submits malicious input to the affected software and trigger a use-after-free condition in the sockfs_setattr function, resulting in a DoS condition

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 28

kernel-tools: before 4.20.11-100.fc28

kernel-headers: before 4.20.11-100.fc28

kernel: before 4.20.11-100.fc28

CPE2.3

• cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*
• cpe:2.3:a:fedoraproject:kernel-tools:*:*:*:*:*:fedora:*:*
• cpe:2.3:a:fedoraproject:kernel-headers:*:*:*:*:*:fedora:*:*
• cpe:2.3:a:fedoraproject:kernel:*:*:*:*:*:fedora:*:*

External links

https://bodhi.fedoraproject.org/updates/FEDORA-2019-16de0047d4

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?

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