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RCE Vulnerability in QBittorrent – Sharp Security (sharpsec.run)

submitted 3 weeks ago by [email protected] to c/[email protected]

17 comments fedilink hide all child comments

I dont know who needs to hear this bit qBittorrent has a nasty vulnerability ( and there are some older ones too)

qBittorrent, on all platforms, did not verify any SSL certificates in its DownloadManager class from 2010 until October 2024. If it failed to verify a cert, it simply logged an error and proceeded.

To be exploitable, this bug requires either MITM access or DNS spoofing attacks, but under those conditions (seen regularly in some countries), impacts are severe.

The primary impact is single-click RCE for Windows builds from 2015 onward, when prompted to update python the exe is downloaded from a hardcoded URL, executed, and then deleted afterwards.

The secondary impact for all platforms is the update RSS feed can be poisoned with malicious update URLs which the user will open in their browser if they accept the prompt to update. This is browser hijacking and arbitrary exe delivery to a user who would likely trust whatever URL this software sent them to.

The tertiary impact is this means that an older CVE (CVE-2019-13640 https://www.cvedetails.com/cve/CVE-2019-13640/) which allowed remote command execution via shell metacharacters could have been exploited by (government) attackers conducting either MITM or DNS spoofing attacks at the time, instead of only by the author of the feed.

Full write up is here: https://sharpsec.run/rce-vulnerability-in-qbittorrent/

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[–] [email protected] 55 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

If you are running Windows [...]

and

from June 2015 until the present, affecting v3.2.1 through v5.0.0 inclusive. The behaviour does not appear to be replicated for other OS variants

[–] [email protected] 13 points 3 weeks ago* (last edited 3 weeks ago)

Notably, 5.0.1 was released three days ago. So a fix is available.

The first patched release is version 5.0.1, released 2 days ago.