Bug 1936472 (CVE-2021-23351) - CVE-2021-23351 golang-github-pires-proxyproto: improper input validation in parseVersion1 function can lead to DoS
Summary: CVE-2021-23351 golang-github-pires-proxyproto: improper input validation in p...
Alias: CVE-2021-23351
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1936473
TreeView+ depends on / blocked
Reported: 2021-03-08 14:43 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-03-08 19:01 UTC (History)
2 users (show)

Fixed In Version:
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Last Closed: 2021-03-08 19:01:52 UTC

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Description Guilherme de Almeida Suckevicz 2021-03-08 14:43:21 UTC
The package github.com/pires/go-proxyproto before 0.5.0 are vulnerable to Denial of Service (DoS) via the parseVersion1() function. The reader in this package is a default bufio.Reader wrapping a net.Conn. It will read from the connection until it finds a newline. Since no limits are implemented in the code, a deliberately malformed V1 header could be used to exhaust memory in a server process using this code - and create a DoS. This can be exploited by sending a stream starting with PROXY and continuing to send data (which does not contain a newline) until the target stops acknowledging. The risk here is small, because only trusted sources should be allowed to send proxy protocol headers.


Upstream patch:

Comment 1 Guilherme de Almeida Suckevicz 2021-03-08 14:43:36 UTC
Created golang-github-pires-proxyproto tracking bugs for this issue:

Affects: fedora-all [bug 1936473]

Comment 2 Product Security DevOps Team 2021-03-08 19:01:52 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

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