CVE-2018-19960

Publication date 7 December 2018

Last updated 8 July 2025

Ubuntu priority

Cvss 3 Severity Score

The debug_mode function in web/web.py in OnionShare through 1.3.1, when --debug is enabled, uses the /tmp/onionshare_server.log pathname for logging, which might allow local users to overwrite files or obtain sensitive information by using this pathname.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
onionshare	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Ignored end of life, was needs-triage
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Not in release
	22.04 LTS jammy	Not affected
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Not affected
	19.10 eoan	Ignored end of life
	19.04 disco	Not affected
	18.10 cosmic	Ignored end of life
	18.04 LTS bionic	Fixed 0.9.2-1ubuntu0.1~esm1
	16.04 LTS xenial	Fixed 0.8.1-1ubuntu0.1~esm1
	14.04 LTS trusty	Not in release

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Notes

john-breton

Per Debian: "Debian uses kernel hardening on Linux by default which renders this non-exploitable (and the release notes state that if rolls a custom kernel the same options need to be enabled). The only remaining impact is that on a multi user environment one user using the debug mode prevents others from using debug mode, but that's mostly a bug, not a security issue." That being said, the fix is trivial. This can be bundled in with other security fixes, and this bug can be fixed as a consequence.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
onionshare	Upsteam: aa5fdde

Severity score breakdown

Parameter	Value
Base score	7.0 · High
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-7625-1
OnionShare vulnerabilities
8 July 2025