Improper input validation in Archisteamfarm Project
CVE-2021-32795
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Archisteamfarm Project
- Justarchinet Archisteamfarm — versions >= 4.3.0.0, < 4.3.1.0
Weakness classification (CWE)
References
- github.com/JustArchiNET/ArchiSteamFarm/security/advisories/GHSA-5v34-4prm-9474 (Exploit, Third Party Advisory)
- github.com/JustArchiNET/ArchiSteamFarm/commit/4cd581ec041912cf199c5512fe6d1dcae… (Patch, Third Party Advisory)
- steamcommunity.com/groups/archiasf/discussions/1/2935742047969570844/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32795?
- CVE-2021-32795 is a medium-severity vulnerability in Archisteamfarm Project, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2021-07-26.
- How severe is CVE-2021-32795?
- Medium severity. CVSS v3 base score is 6.5 out of 10.