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GHSA-2phg-qgmm-r638
No affected components available
Summary
GzipEncoder does not limit output size when processing compressed data. This allows unauthenticated remote attackers to crash sliver server by sending a http request with highly compressed gzip data (aka zip bomb).
Details
In util/encoders/gzip.go, Decode() method decompresses given data by reading the entire gzip buffer at once without limiting output size.
PoC
data = gzip.compress(bytes(1024 * 1024 * 1024)) * 16
requests.post(f"http://172.17.0.2/{nonce}", data=data)
Impact
Unauthenticated remote attackers can exhaust memory and cpu resource of sliver server and crash it when they have GzipEncoderID, which can be easily retrived from implant's http traffic, or by brute-forcing.
A fixed version is available at https://github.com/BishopFox/sliver/releases/tag/v1.7.2.
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.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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