Full Disclosure mailing list archives
Re: Anomaly in Fedora `dnf update`: md5 mismatch of result
From: Adrean Boyadzhiev <adrean.boyadzhiev () gmail com>
Date: Tue, 15 Aug 2023 21:25:26 +0300
Probably a completely different root cause, but I have noticed similar behavior with a Debian-based distribution during `# apt upgrade` and when there are many packages for update and the internet connection is not so good. I haven't investigated, but my assumptions were either Race Conditions within verification logic or some logic related to the timestamp.
Also, isn't md5 deprecated and known to suck much?
To my knowledge `md5` should be ok for calculating hash sums, many prefer it since the algorithm is relatively fast and simple.
Best regards, -- Adrean Boyadzhiev https://lambdabit.io On 8/14/23 14:43, Georgi Guninski wrote:
In short, I found anomaly in Fedora 37 and would like to know if it is vulnerability. As root type in terminal: dnf update If there is kernel update, watch stdout and stderr for: ##On Mon Aug 14 05:33:29 AM UTC 2023 (2/6): kernel-6.4.10-100.fc37.x86_64.rpm 1.2 MB/s | 140 kB 00:00 /var/cache/dnf/updates-fd4d3d0d1c34d49a/packages/kernel-modules-extra-6.4.9-100.fc37_6.4.10-100.fc37.x86_64.drpm: md5 mismatch of result ##$ md5sum /var/cache/dnf/updates-fd4d3d0d1c34d49a/packages/kernel-modules-extra-6.4.9-100.fc37_6.4.10-100.fc37.x86_64.drpm 356ea04e06bd58db4a15c64e64432f1a /var/cache/dnf/updates-fd4d3d0d1c34d49a/packages/kernel-modules-extra-6.4.9-100.fc37_6.4.10-100.fc37.x86_64.drpm Another possible approach: install Fedora 37 in VM without internet access and then do `dnf update` (haven't tested this yet). After second download, the kernel update passes, but I don't understand why the second download via http://mirror should pass. Examining the dnf source is option. Open problem: Can this be vulnerability, possibly assuming hostile mirror or network? Also, isn't md5 deprecated and known to suck much?
Attachment:
OpenPGP_0xC5FFCE15F846C301.asc
Description: OpenPGP public key
Attachment:
OpenPGP_signature.asc
Description: OpenPGP digital signature
_______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: https://seclists.org/fulldisclosure/
Current thread:
- Anomaly in Fedora `dnf update`: md5 mismatch of result Georgi Guninski (Aug 15)
- Re: Anomaly in Fedora `dnf update`: md5 mismatch of result Adrean Boyadzhiev (Aug 19)
- Re: Anomaly in Fedora `dnf update`: md5 mismatch of result Matthew Fernandez (Aug 19)
- Re: Anomaly in Fedora `dnf update`: md5 mismatch of result Michael Lazin (Aug 19)
- Re: Anomaly in Fedora `dnf update`: md5 mismatch of result Jeffrey Walton (Aug 19)