Local denial of service in Tinyproxy



Published: 2017-07-30 | Updated: 2023-08-20
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-11747
CWE-ID CWE-362
Exploitation vector Local
Public exploit N/A
Vulnerable software
Subscribe 		tinyproxy
Other software / Other software solutions

Vendor tinyproxy

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Race condition

EUVDB-ID: #VU79739

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 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

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

External links

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


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.



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