accountsservice drops ruid, allows unprivileged users to send it signals
CVE-2020-16126

3.3LOW

Key Information:

Vendor

Freedesktop

Status
Accountsservice
Vendor
CVE Published:
11 November 2020
🔔 Create Freedesktop Vulnerability Alert

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-16126?

An Ubuntu-specific modification to AccountsService in versions before 0.6.55-0ubuntu13.2, among other earlier versions, improperly dropped the ruid, allowing untrusted users to send signals to AccountService, thus stopping it from handling D-Bus messages in a timely fashion.

Affected Version(s)

accountsservice 0.6.35-0ubuntu7.3 < 0.6.35-0ubuntu7.3+esm2

accountsservice 0.6.40-2ubuntu11 < 0.6.40-2ubuntu11.6

accountsservice 0.6.45-1ubuntu1 < 0.6.45-1ubuntu1.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

Ubuntu-Gnome-privilege-escalation
Created by zev3n

References

https://securitylab.github.com/advisories/GHSL-2020-187-a...
x_refsource_MISC

CVSS V3.1

Score:
3.3
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kevin Backhouse
.
CVE-2020-16126 : accountsservice drops ruid, allows unprivileged users to send it signals