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CVE-2021-32795— Denial of Service via Steam chat in ArchiSteamFarm

Quick assessment

Affected
JustArchiNET ArchiSteamFarm
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.

ArchiSteamFarm是一个 C应用程序，主要目的是同时从多个帐户中空闲 Steam 卡。 JustArchiNET ArchiSteamFarm存在输入验证错误漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。

CVSS 6.5 · Medium EPSS 1.72% · P75
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I. Basic Information for CVE-2021-32795

Vulnerability Information
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Vulnerability Title
Denial of Service via Steam chat in ArchiSteamFarm
Source: CVE Program / CVE List V5
Vulnerability Description
ArchiSteamFarm is a C# application with primary purpose of idling Steam cards from multiple accounts simultaneously. In versions prior to 4.3.1.0 a Denial of Service (aka DoS) vulnerability which allows attacker to remotely crash running ASF instance through sending a specifically-crafted Steam chat message exists. The user sending the message does not need to be authorized within the bot or ASF process. The attacker needs to know ASF's `CommandPrefix` in advance, but majority of ASF setups run with an unchanged default value. This attack does not allow attacker to gain any potentially-sensitive information, such as logins or passwords, does not allow to execute arbitrary commands and otherwise exploit the crash further. The issue is patched in ASF V4.3.1.0. The only workaround which guarantees complete protection is running all bots with `OnlineStatus` of `0` (Offline). In this setup, ASF is able to ignore even the specifically-crafted message without attempting to interpret it.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
JustArchiNET ArchiSteamFarm 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ArchiSteamFarm是一个 C# 应用程序，主要目的是同时从多个帐户中空闲 Steam 卡。 JustArchiNET ArchiSteamFarm存在输入验证错误漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
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
JustArchiNET ArchiSteamFarm >= 4.3.0.0, < 4.3.1.0 -

II. Public POCs for CVE-2021-32795

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III. Intelligence Information for CVE-2021-32795

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Patches & Fixes for CVE-2021-32795 (1)

Vendor Advisories for CVE-2021-32795 (1)

Other References for CVE-2021-32795 (1)

IV. Related Vulnerabilities

Same product: ArchiSteamFarm
Same vendor: JustArchiNET
Same weakness: CWE-20

V. Comments for CVE-2021-32795

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