Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-3939— Free of static data in accountsservice

Quick assessment

Affected
Ubuntu accountsservice
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Canonical Ubuntu是英国科能（Canonical）公司的一套以桌面应用为主的GNU/Linux操作系统。 Canonical Ubuntu 存在安全漏洞，该漏洞源于 Ubuntu 对accountsservice 的特定修改导致在user_change_language_authorized_cb 函数中指向静态存储的fallback_locale 变量被释放。

CVSS 7.8 · High EPSS 0.37% · P29
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-3939

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Free of static data in accountsservice
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放并不在堆上的内存
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical Ubuntu 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical Ubuntu是英国科能（Canonical）公司的一套以桌面应用为主的GNU/Linux操作系统。 Canonical Ubuntu 存在安全漏洞，该漏洞源于 Ubuntu 对accountsservice 的特定修改导致在user_change_language_authorized_cb 函数中指向静态存储的fallback_locale 变量被释放。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ubuntu accountsservice 0.6.55-0ubuntu12~20.04 ~ 0.6.55-0ubuntu12~20.04.5 -

II. Public POCs for CVE-2021-3939

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-3939

请登录查看更多情报信息。

Vendor Advisories for CVE-2021-3939 (1)

Exploits & Public PoCs for CVE-2021-3939 (1)

IV. Related Vulnerabilities

Same product: accountsservice
Same vendor: Ubuntu
Same weakness: CWE-590

V. Comments for CVE-2021-3939

No comments yet

Leave a comment