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CVE-2006-0591

Status: ModifiedLow (1.2)—

The crypt_gensalt functions for BSDI-style extended DES-based and FreeBSD-sytle MD5-based password hashes in crypt_blowfish 0.4.7 and earlier do not evenly and randomly distribute salts, which makes it easier for attackers to guess passwords from a stolen password file due to the increased number of collisions.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Solar Designer — Crypt Blowfish

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2006-0591",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 1.2,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:H/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 1.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2006-02-08T01:02:00.000",
  "references": [
    {
      "url": "ftp://patches.sgi.com/support/free/security/advisories/20060602-01-U.asc",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://cvsweb.openwall.com/cgi/cvsweb.cgi/Owl/packages/glibc/crypt_blowfish/crypt_gensalt.c?only_with_tag=CRYPT_BLOWFISH_1_0",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/18772",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/20232",
      "tags": [
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      "source": "cve@mitre.org"
    },
    {
      "url": "http://secunia.com/advisories/20653",
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      "source": "cve@mitre.org"
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    {
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      "source": "cve@mitre.org"
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    {
      "url": "http://support.avaya.com/elmodocs2/security/ASA-2006-113.htm",
      "source": "cve@mitre.org"
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    {
      "url": "http://www.osvdb.org/23005",
      "source": "cve@mitre.org"
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    {
      "url": "http://www.redhat.com/support/errata/RHSA-2006-0526.html",
      "source": "cve@mitre.org"
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    {
      "url": "http://www.securityfocus.com/archive/1/424260/100/0/threaded",
      "source": "cve@mitre.org"
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    {
      "url": "http://www.vupen.com/english/advisories/2006/0477",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://cvsweb.openwall.com/cgi/cvsweb.cgi/Owl/packages/glibc/crypt_blowfish/crypt_gensalt.c?only_with_tag=CRYPT_BLOWFISH_1_0",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    },
    {
      "url": "http://secunia.com/advisories/20232",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "http://secunia.com/advisories/20653",
      "tags": [
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://secunia.com/advisories/20782",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://support.avaya.com/elmodocs2/security/ASA-2006-113.htm",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.osvdb.org/23005",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.redhat.com/support/errata/RHSA-2006-0526.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/archive/1/424260/100/0/threaded",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.vupen.com/english/advisories/2006/0477",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/24590",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11502",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-310"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The crypt_gensalt functions for BSDI-style extended DES-based and FreeBSD-sytle MD5-based password hashes in crypt_blowfish 0.4.7 and earlier do not evenly and randomly distribute salts, which makes it easier for attackers to guess passwords from a stolen password file due to the increased number of collisions."
    },
    {
      "lang": "es",
      "value": "Las funciones crypt_gensalt de huellas digitales ('hashes') de contraseñas basadas en DES extendidas con estilo BSDI y basadas en MD5 con estilo FreeBSD en crypt_blowfish 0.4.7 y anteriores no distribuyen las sales equitativamente y aleatoriamente en el espacio de huellas digitales, lo que hace más fácil a atacantes averiguar contraseñas de un fichero de contraseñas robado debido al número de colisiones aumentado."
    }
  ],
  "lastModified": "2026-06-16T22:20:54.253",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:solar_designer:crypt_blowfish:0.4.7:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DA3C183A-C8DA-4AC2-B708-4EA5CBADC14C"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "evaluatorComment": "This vulnerability may only be exploited in conjunction with another vulnerability.  The password file (normally shadowed) must first be stolen.",
  "sourceIdentifier": "cve@mitre.org"
}