OSV-2019-1 ASSERT: bufferRemainingSize() >= length.
An assertion failure in Envoy's HTTP/1 connection handling can cause a crash, leading to denial of service for network services.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2019-1?
OSV-2019-1 is a denial of service vulnerability in envoy, published on 29 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18431
Crash type: ASSERT
Crash state:
bufferRemainingSize() >= length.
Envoy::Http::Http1::ConnectionImpl::copyToBuffer
Envoy::Http::Http1::RequestStreamEncoderImpl::encodeHeaders
Which versions are affected by OSV-2019-1?
1 open source package ship an affected version, including envoy.
| Package | Affected | Fixed in |
|---|---|---|
envoy OSS-Fuzz | All versions | None |
How do I fix OSV-2019-1?
No fix has been published for OSV-2019-1 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is OSV-2019-1 being exploited?
There is no known exploitation of OSV-2019-1 in the wild and no public exploit code.