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GHSA-7h24-c332-p48c

HighCVSS 7.5 / 10
Published Jul 30, 2025·Last modified Jul 31, 2025
Affected Components(0)

No affected components available

Description

Summary

Untrusted, user-controlled data from the HTTP Proxy-Authorization header can induce a denial of service state.

Details

Untrusted data is extracted from the user-controlled HTTP Proxy-Authorization header and passed to Extension::try_from and flows into parse_ttl_extension where it is parsed as a TTL value. If an attacker supplies a TTL of zero (e.g. by using a username such as 'configuredUser-ttl-0'), the modulo operation 'timestamp % ttl' will cause a division by zero panic, causing the server to crash causing a denial-of-service.

The code assumed to be responsible for this can be found here: https://github.com/0x676e67/vproxy/blob/ab304c3854bf8480be577039ada0228907ba0923/src/extension.rs#L173-L183

PoC

  1. Download and run the latest version of vproxy
  2. Send a cUrl request like the following, adjusting address and port as necessary: curl -x "http://test-ttl-0:test@127.0.0.1:8101" https://google.com
  3. Wait for a cUrl error indicating "Proxy CONNECT aborted"
  4. View logs from the vproxy server
  5. Observe that the vproxy server crashed due to a divide-by-zero panic

Impact

The resulting crash renders the proxy server unusable until it is reset.

Finally, one last note: I'm reporting this on behalf of another researcher at Black Duck. Credit for discovery should be attributed to David Bohannon (dbohannon)

Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. 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 availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.54%

The exploit probability is very low. The vulnerability is unlikely 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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