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CVE-2021-3939

Status Candidate

Overview

Ubuntu-specific modifications to accountsservice (in patch file debian/patches/0010-set-language.patch) caused the fallback_locale variable, pointing to static storage, to be freed, in the user_change_language_authorized_cb function. This is reachable via the SetLanguage dbus function. This is fixed in versions 0.6.55-0ubuntu12~20.04.5, 0.6.55-0ubuntu13.3, 0.6.55-0ubuntu14.1.

Related Files

Ubuntu accountsservice Double-Free Memory Corruption
Posted Jun 12, 2023
Authored by Kevin Backhouse, GitHub Security Lab

Proof of concept exploit for a double-free memory corruption vulnerability in Ubuntu accountsservice.

tags | exploit, proof of concept
systems | linux, ubuntu
advisories | CVE-2021-3939
SHA-256 | a24f0c965168bcc3814136c8ee24f8fd5c7b0fb07f7be9bcaa47978b144f0e8f
Ubuntu Security Notice USN-5149-1
Posted Nov 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5149-1 - Kevin Backhouse discovered that AccountsService incorrectly handled memory when performing certain language setting operations. A local attacker could use this issue to escalate privileges.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2021-3939
SHA-256 | 0183300b73a168e52d3f29741265462c012571234ef6c3e63b0ff9bfdc7887b1
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