Executive Summary

This vulnerability occurs when a malicious SSH peer sends unsolicited global request responses to a Go SSH server, which fills an internal buffer and blocks the connection's read loop.

Because the read loop is blocked, the goroutine handling the connection cannot be released even if the connection is closed, leading to a resource leak for each affected connection.

The issue has been fixed by discarding unsolicited global responses to prevent the buffer from filling and blocking the read loop.

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Impact Analysis

This vulnerability can cause resource leaks on the server handling SSH connections, as each malicious connection that sends unsolicited global request responses can block a goroutine indefinitely.

Over time, this can exhaust server resources, potentially leading to degraded performance or denial of service due to the accumulation of blocked goroutines.

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Mitigation Strategies

To mitigate this vulnerability, update the golang.org/x/crypto package to version 0.52.0 or later, where unsolicited global SSH request responses are discarded to prevent resource leaks.

This fix addresses the issue by preventing the internal buffer from filling and blocking the connection's read loop, thus avoiding the resource leak per connection.

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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