rhsa-2003_395
Vulnerability from csaf_redhat
Published
2003-12-11 00:21
Modified
2024-11-21 22:54
Summary
Red Hat Security Advisory: gnupg security update

Notes

Topic
Updated gnupg packages are now available for Red Hat Enterprise Linux. These updates disable the ability to generate ElGamal keys (used for both signing and encrypting) and disable the ability to use ElGamal public keys for encrypting data.
Details
GnuPG is a utility for encrypting data and creating digital signatures. Phong Nguyen identified a severe bug in the way GnuPG creates and uses ElGamal keys, when those keys are used both to sign and encrypt data. This vulnerability can be used to trivially recover the private key. While the default behavior of GnuPG when generating keys does not lead to the creation of unsafe keys, by overriding the default settings an unsafe key could have been created. If you are using ElGamal keys, you should revoke those keys immediately. The packages included in this update do not make ElGamal keys safe to use; they merely include a patch by David Shaw that disables functions that would generate or use ElGamal keys. To determine if your key is affected, run the following command to obtain a list of secret keys that you have on your secret keyring: gpg --list-secret-keys The output of this command includes both the size and type of the keys found, and will look similar to this example: /home/example/.gnupg/secring.gpg ---------------------------------------------------- sec 1024D/01234567 2000-10-17 Example User <example@example.com> uid Example User <example@example.com> The key length, type, and ID are listed together, separated by a forward slash. In the example output above, the key's type is "D" (DSA, sign and encrypt). Your key is unsafe if and only if the key type is "G" (ElGamal, sign and encrypt). In the above example, the secret key is safe to use, while the secret key in the following example is not: /home/example/.gnupg/secring.gpg ---------------------------------------------------- sec 1024G/01234567 2000-10-17 Example User <example@example.com> uid Example User <example@example.com> For more details regarding this issue, as well as instructions on how to revoke any keys that are unsafe, refer to the advisory available from the GnuPG web site: http://www.gnupg.org/
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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        "category": "summary",
        "text": "Updated gnupg packages are now available for Red Hat Enterprise Linux. \nThese updates disable the ability to generate ElGamal keys (used for both\nsigning and encrypting) and disable the ability to use ElGamal public keys\nfor encrypting data.",
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        "text": "GnuPG is a utility for encrypting data and creating digital signatures.\n\nPhong Nguyen identified a severe bug in the way GnuPG creates and uses\nElGamal keys, when those keys are used both to sign and encrypt data.  This\nvulnerability can be used to trivially recover the private key.  While the\ndefault behavior of GnuPG when generating keys does not lead to the\ncreation of unsafe keys, by overriding the default settings an unsafe key\ncould have been created.\n\nIf you are using ElGamal keys, you should revoke those keys immediately.\n\nThe packages included in this update do not make ElGamal keys safe to use;\nthey merely include a patch by David Shaw that disables functions that\nwould generate or use ElGamal keys.\n\nTo determine if your key is affected, run the following command to obtain a\nlist of secret keys that you have on your secret keyring:\n\ngpg --list-secret-keys\n\nThe output of this command includes both the size and type of the keys\nfound, and will look similar to this example:\n\n/home/example/.gnupg/secring.gpg\n----------------------------------------------------\nsec  1024D/01234567 2000-10-17 Example User \u003cexample@example.com\u003e\nuid                            Example User \u003cexample@example.com\u003e\n\nThe key length, type, and ID are listed together, separated by a forward\nslash.  In the example output above, the key\u0027s type is \"D\" (DSA, sign\nand encrypt).  Your key is unsafe if and only if the key type is \"G\"\n(ElGamal, sign and encrypt).  In the above example, the secret key is safe\nto use, while the secret key in the following example is not:\n\n/home/example/.gnupg/secring.gpg\n----------------------------------------------------\nsec  1024G/01234567 2000-10-17 Example User \u003cexample@example.com\u003e\nuid                            Example User \u003cexample@example.com\u003e\n\nFor more details regarding this issue, as well as instructions on how to\nrevoke any keys that are unsafe, refer to the advisory available from the\nGnuPG web site:\n\nhttp://www.gnupg.org/",
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            "3ES:gnupg-debuginfo-0:1.2.1-10.i386",
            "3ES:gnupg-debuginfo-0:1.2.1-10.ia64",
            "3ES:gnupg-debuginfo-0:1.2.1-10.ppc",
            "3ES:gnupg-debuginfo-0:1.2.1-10.s390",
            "3ES:gnupg-debuginfo-0:1.2.1-10.s390x",
            "3ES:gnupg-debuginfo-0:1.2.1-10.x86_64",
            "3WS:gnupg-0:1.2.1-10.i386",
            "3WS:gnupg-0:1.2.1-10.ia64",
            "3WS:gnupg-0:1.2.1-10.ppc",
            "3WS:gnupg-0:1.2.1-10.s390",
            "3WS:gnupg-0:1.2.1-10.s390x",
            "3WS:gnupg-0:1.2.1-10.src",
            "3WS:gnupg-0:1.2.1-10.x86_64",
            "3WS:gnupg-debuginfo-0:1.2.1-10.i386",
            "3WS:gnupg-debuginfo-0:1.2.1-10.ia64",
            "3WS:gnupg-debuginfo-0:1.2.1-10.ppc",
            "3WS:gnupg-debuginfo-0:1.2.1-10.s390",
            "3WS:gnupg-debuginfo-0:1.2.1-10.s390x",
            "3WS:gnupg-debuginfo-0:1.2.1-10.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2003:395"
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "security flaw"
    }
  ]
}


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