CVE-2021-25905: Bra Out Of Bounds Read Vulnerability

CRITICAL
Advisory Identifier: GHSA-j8qq-58cr-8cc7
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CVSS 9.1
CWE-125 CWE-908
Published
Advisory Summary

CVE-2021-25905 is a CRITICAL (CVSS 9.1) out of bounds read vulnerability (CWE-125: Out-of-bounds Read) affecting Bra libraries in the crates.io ecosystem. The issue involves out of bounds read in bra. Remediation is available by upgrading affected packages to version 0.1.1.

CVE-2021-25905 at a Glance

CVE Identifier CVE-2021-25905
GHSA Identifier GHSA-j8qq-58cr-8cc7
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-125: Out-of-bounds Read
Affected Product Bra
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 9.1

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

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

How to Fix CVE-2021-25905

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

bra fixed: 0.1.1 
Upgrade bra to 0.1.1
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 bra

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-25905, inspect your project dependencies for Bra:

inspect dependencies for bra

Analyze the terminal output to locate any version of Bra in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.1.1), 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-125: Out-of-bounds Read, where the product reads data past the end, or before the beginning, of the intended buffer. In Bra, 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

Buffered Random Access (BRA) provides easy random memory access to a sequential source of data in Rust. This is achieved by greedily retaining all memory read from a given source. Buffered Random Access (BRA) provides easy random memory access to a sequential source of data in Rust. An issue was discovered in the bra crate before 0.1.1 for Rust. It lacks soundness because it can read uninitialized memory.

CVE-2021-25905 Affected Bra Versions

1 component(s)
Fixed Versions:
0.1.1
Product / Package Ecosystem Affected Versions Fixed Version
bra
 crates.io
< 0.1.1
0.1.1

References

NVD — CVE-2021-25905 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-25905
Bra Source Repository REPOSITORY
https://github.com/Enet4/bra-rs/issues/1
Security Fix Commit FIX COMMIT
https://github.com/Enet4/bra-rs/commit/aabf5562f8c6374ab30f615b28e0cff9b5c79e5f
Bra Source Repository REPOSITORY
https://github.com/Enet4/bra-rs
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0008.html

Frequently Asked Questions

What is CVE-2021-25905?
CVE-2021-25905 is a security vulnerability in Bra involving Out of bounds read in bra under CWE-125: Out-of-bounds Read.
Which Bra versions are affected?
Affected versions include releases prior to 0.1.1 across affected packages: bra.
What version fixes CVE-2021-25905?
Upgrading to 0.1.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is bra affected?
Yes, bra is affected in releases prior to 0.1.1. Upgrade your dependency to 0.1.1 or later.
What is the CVSS score of CVE-2021-25905?
CVE-2021-25905 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
What CWE is associated with CVE-2021-25905?
CVE-2021-25905 is classified under CWE-125: Out-of-bounds Read (The product reads data past the end, or before the beginning, of the intended buffer.).
How can I check crates.io dependencies for CVE-2021-25905?
Run the dependency tree command: 'inspect dependencies for bra'. 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-j8qq-58cr-8cc7",
  "modified" : "2022-05-05T00:44:22Z",
  "published" : "2021-08-25T20:52:53Z",
  "aliases" : [ "CVE-2021-25905" ],
  "summary" : "Out of bounds read in bra",
  "details" : "Buffered Random Access (BRA) provides easy random memory access to a sequential source of data in Rust. This is achieved by greedily retaining all memory read from a given source. Buffered Random Access (BRA) provides easy random memory access to a sequential source of data in Rust. An issue was discovered in the bra crate before 0.1.1 for Rust. It lacks soundness because it can read uninitialized memory.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "bra"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-25905"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Enet4/bra-rs/issues/1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Enet4/bra-rs/commit/aabf5562f8c6374ab30f615b28e0cff9b5c79e5f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Enet4/bra-rs"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0008.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-125", "CWE-908" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T18:46:05Z",
    "nvd_published_at" : "2021-01-26T18:16:00Z"
  }
}