CVE-2017-1000070: Github.com/bitly/oauth2 proxy Open Redirect Vulnerability

MODERATE
Advisory Identifier: GHSA-jm34-xm8m-w958
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CVSS 6.1
CWE-601
Published
Advisory Summary

CVE-2017-1000070 is a MODERATE (CVSS 6.1) open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Github.com/bitly/oauth2 proxy libraries in the Go ecosystem. The issue involves open redirect in oauth2_proxy. Remediation is available by upgrading affected packages to version 2.2.0.

CVE-2017-1000070 at a Glance

CVE Identifier CVE-2017-1000070
GHSA Identifier GHSA-jm34-xm8m-w958
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Github.com/bitly/oauth2 proxy
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2017-1000070

To remediate this vulnerability, upgrade all affected Github.com/bitly/oauth2 proxy dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/bitly/oauth2_proxy fixed: 2.2.0 
Upgrade github.com/bitly/oauth2_proxy to 2.2.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/bitly/oauth2_proxy

How to Check if You Are Affected

To determine whether your application is affected by CVE-2017-1000070, inspect your project dependencies for Github.com/bitly/oauth2 proxy:

inspect dependencies for github.com/bitly/oauth2_proxy

Analyze the terminal output to locate any version of Github.com/bitly/oauth2 proxy in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Github.com/bitly/oauth2 proxy, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

The Bitly oauth2_proxy in version 2.1 and earlier was affected by an open redirect vulnerability during the start and termination of the 2-legged OAuth flow. This issue was caused by improper input validation and a violation of RFC-6819

CVE-2017-1000070 Affected Github.com/bitly/oauth2 proxy Versions

1 component(s)
Fixed Versions:
2.2.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/bitly/oauth2_proxy
golang/github.com/bitly/oauth2_proxy
Go
< 2.2.0
2.2.0

References

NVD — CVE-2017-1000070 NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-1000070
Github.com/bitly/oauth2 proxy Source Repository REPOSITORY
https://github.com/bitly/oauth2_proxy/issues/228
Github.com/bitly/oauth2 proxy Source Repository REPOSITORY
https://github.com/bitly/oauth2_proxy/pull/359
Security Fix Commit FIX COMMIT
https://github.com/bitly/oauth2_proxy/commit/289a6ccf463a425c7606178c510fc5eeb9c8b050
tools.ietf.org/html/rfc6819 WEB
https://tools.ietf.org/html/rfc6819#section-5.2.3.5
NVD — CVE-2017-1000070 NVD
https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-1000070

Frequently Asked Questions

What is CVE-2017-1000070?
CVE-2017-1000070 is a security vulnerability in Github.com/bitly/oauth2 proxy involving Open Redirect in oauth2_proxy under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Github.com/bitly/oauth2 proxy versions are affected?
Affected versions include releases prior to 2.2.0 across affected packages: github.com/bitly/oauth2_proxy.
What version fixes CVE-2017-1000070?
Upgrading to 2.2.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/bitly/oauth2_proxy affected?
Yes, github.com/bitly/oauth2_proxy is affected in releases prior to 2.2.0. Upgrade your dependency to 2.2.0 or later.
What is the CVSS score of CVE-2017-1000070?
CVE-2017-1000070 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2017-1000070?
CVE-2017-1000070 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check Go dependencies for CVE-2017-1000070?
Run the dependency tree command: 'inspect dependencies for github.com/bitly/oauth2_proxy'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-jm34-xm8m-w958",
  "modified" : "2021-05-19T22:31:56Z",
  "published" : "2021-12-20T18:04:40Z",
  "aliases" : [ "CVE-2017-1000070" ],
  "summary" : "Open Redirect in oauth2_proxy",
  "details" : "The Bitly oauth2_proxy in version 2.1 and earlier was affected by an open redirect vulnerability during the start and termination of the 2-legged OAuth flow. This issue was caused by improper input validation and a violation of RFC-6819",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/bitly/oauth2_proxy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-1000070"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bitly/oauth2_proxy/issues/228"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bitly/oauth2_proxy/pull/359"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/bitly/oauth2_proxy/commit/289a6ccf463a425c7606178c510fc5eeb9c8b050"
  }, {
    "type" : "WEB",
    "url" : "https://tools.ietf.org/html/rfc6819#section-5.2.3.5"
  }, {
    "type" : "WEB",
    "url" : "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-1000070"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-19T22:31:56Z",
    "nvd_published_at" : null
  }
}