CVE-2021-23841: Openssl src Integer Overflow Vulnerability

MODERATE
Advisory Identifier: GHSA-84rm-qf37-fgc2
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CVSS 5.9
CWE-190 CWE-476
Published
Advisory Summary

CVE-2021-23841 is a MODERATE (CVSS 5.9) integer overflow vulnerability (CWE-190: Integer Overflow or Wraparound) affecting Openssl src libraries in the crates.io ecosystem. The issue involves integer overflow in openssl-src. Remediation is available by upgrading affected packages to version 111.14.0.

CVE-2021-23841 at a Glance

CVE Identifier CVE-2021-23841
GHSA Identifier GHSA-84rm-qf37-fgc2
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-190: Integer Overflow or Wraparound
Affected Product Openssl src
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 5.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2021-23841

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

openssl-src fixed: 111.14.0 
Upgrade openssl-src to 111.14.0
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 openssl-src

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-23841, inspect your project dependencies for Openssl src:

inspect dependencies for openssl-src

Analyze the terminal output to locate any version of Openssl src in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 111.14.0), 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-190: Integer Overflow or Wraparound, where the product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. this occurs when an integer value is incremented to a value that is too large to store in the associated representation. when this occurs, the value may become a very small or negative number. In Openssl src, 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

Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

CVE-2021-23841 Affected Openssl src Versions

1 component(s)
Fixed Versions:
111.14.0
Product / Package Ecosystem Affected Versions Fixed Version
openssl-src
 crates.io
< 111.14.0
111.14.0

References

NVD — CVE-2021-23841 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23841
Openssl src Security Information SECURITY
https://www.tenable.com/security/tns-2021-09
Openssl src Security Information SECURITY
https://www.tenable.com/security/tns-2021-03
Openssl src Security Information SECURITY
https://www.oracle.com/security-alerts/cpuoct2021.html
Openssl src Security Information SECURITY
https://www.oracle.com/security-alerts/cpuapr2022.html
Openssl src Security Information SECURITY
https://www.oracle.com/security-alerts/cpuApr2021.html
Openssl src Security Information SECURITY
https://www.oracle.com//security-alerts/cpujul2021.html
www.openssl.org/news/secadv/2021021... WEB
https://www.openssl.org/news/secadv/20210216.txt
Openssl src Security Information SECURITY
https://www.debian.org/security/2021/dsa-4855
support.apple.com/kb/ht212534 WEB
https://support.apple.com/kb/HT212534
support.apple.com/kb/ht212529 WEB
https://support.apple.com/kb/HT212529
support.apple.com/kb/ht212528 WEB
https://support.apple.com/kb/HT212528
Openssl src Security Information SECURITY
https://security.netapp.com/advisory/ntap-20210513-0002
Openssl src Security Information SECURITY
https://security.netapp.com/advisory/ntap-20210219-0009
Openssl src Security Information SECURITY
https://security.gentoo.org/glsa/202103-03
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0058.html
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0058
Openssl src Security Information SECURITY
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846
Openssl src Source Repository REPOSITORY
https://github.com/alexcrichton/openssl-src-rs
git.openssl.org/gitweb/ WEB
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9b1129239f3ebb1d1c98ce9ed41d5c9476c47cb2
git.openssl.org/gitweb/ WEB
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807
git.openssl.org/gitweb/ WEB
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a51b9e1d0cf0bf8515f7201b68fb0a3482b3dc1
git.openssl.org/gitweb/ WEB
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=122a19ab48091c657f7cb1fb3af9fc07bd557bbf
cert-portal.siemens.com/productcert/pdf/ssa... WEB
https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
seclists.org/fulldisclosure/2021... WEB
http://seclists.org/fulldisclosure/2021/May/67
seclists.org/fulldisclosure/2021... WEB
http://seclists.org/fulldisclosure/2021/May/68
seclists.org/fulldisclosure/2021... WEB
http://seclists.org/fulldisclosure/2021/May/70

Frequently Asked Questions

What is CVE-2021-23841?
CVE-2021-23841 is a security vulnerability in Openssl src involving Integer Overflow in openssl-src under CWE-190: Integer Overflow or Wraparound.
Which Openssl src versions are affected?
Affected versions include releases prior to 111.14.0 across affected packages: openssl-src.
What version fixes CVE-2021-23841?
Upgrading to 111.14.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is openssl-src affected?
Yes, openssl-src is affected in releases prior to 111.14.0. Upgrade your dependency to 111.14.0 or later.
What is the CVSS score of CVE-2021-23841?
CVE-2021-23841 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-23841?
CVE-2021-23841 is classified under CWE-190: Integer Overflow or Wraparound (The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.).
How can I check crates.io dependencies for CVE-2021-23841?
Run the dependency tree command: 'inspect dependencies for openssl-src'. 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-84rm-qf37-fgc2",
  "modified" : "2021-08-19T17:35:19Z",
  "published" : "2021-08-25T20:52:21Z",
  "aliases" : [ "CVE-2021-23841" ],
  "summary" : "Integer Overflow in openssl-src",
  "details" : "Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "openssl-src"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
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  "references" : [ {
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  }, {
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    "url" : "https://www.tenable.com/security/tns-2021-09"
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    "type" : "WEB",
    "url" : "https://www.tenable.com/security/tns-2021-03"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpuoct2021.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpuapr2022.html"
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    "type" : "WEB",
    "url" : "https://www.oracle.com/security-alerts/cpuApr2021.html"
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    "type" : "WEB",
    "url" : "https://www.oracle.com//security-alerts/cpujul2021.html"
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    "url" : "https://www.openssl.org/news/secadv/20210216.txt"
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    "type" : "WEB",
    "url" : "https://www.debian.org/security/2021/dsa-4855"
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    "type" : "WEB",
    "url" : "https://support.apple.com/kb/HT212534"
  }, {
    "type" : "WEB",
    "url" : "https://support.apple.com/kb/HT212529"
  }, {
    "type" : "WEB",
    "url" : "https://support.apple.com/kb/HT212528"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20210513-0002"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20210219-0009"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/202103-03"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0058.html"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0058"
  }, {
    "type" : "WEB",
    "url" : "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/alexcrichton/openssl-src-rs"
  }, {
    "type" : "WEB",
    "url" : "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9b1129239f3ebb1d1c98ce9ed41d5c9476c47cb2"
  }, {
    "type" : "WEB",
    "url" : "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=8252ee4d90f3f2004d3d0aeeed003ad49c9a7807"
  }, {
    "type" : "WEB",
    "url" : "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a51b9e1d0cf0bf8515f7201b68fb0a3482b3dc1"
  }, {
    "type" : "WEB",
    "url" : "https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=122a19ab48091c657f7cb1fb3af9fc07bd557bbf"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"
  }, {
    "type" : "WEB",
    "url" : "http://seclists.org/fulldisclosure/2021/May/67"
  }, {
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  }, {
    "type" : "WEB",
    "url" : "http://seclists.org/fulldisclosure/2021/May/70"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-190", "CWE-476" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T17:35:19Z",
    "nvd_published_at" : "2021-02-16T17:15:00Z"
  }
}