Vulnerability identifier: #VU79739

Vulnerability risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-11747

CWE-ID: CWE-362

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
tinyproxy
Other software / Other software solutions

Vendor: tinyproxy

Description

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

The vulnerability exists due to a race condition when dropping privileges to a non-root account for the /run/tinyproxy/tinyproxy.pid file. A local user can exploit the race and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

tinyproxy: 1.8.0 - 1.8.4

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External links
http://github.com/tinyproxy/tinyproxy/issues/106
http://lists.debian.org/debian-lts-announce/2020/03/msg00037.html

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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.