rhsa-2012_0309
Vulnerability from csaf_redhat
Published
2012-02-21 02:20
Modified
2024-11-22 04:05
Summary
Red Hat Security Advisory: sudo security and bug fix update

Notes

Topic
An updated sudo package that fixes one security issue and various bugs is now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having low security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
Details
The sudo (superuser do) utility allows system administrators to give certain users the ability to run commands as root. A flaw was found in the sudo password checking logic. In configurations where the sudoers settings allowed a user to run a command using sudo with only the group ID changed, sudo failed to prompt for the user's password before running the specified command with the elevated group privileges. (CVE-2011-0010) In addition, this update fixes the following bugs: * A NULL pointer dereference bug caused the sudo utility to terminate unexpectedly with a segmentation fault. This happened if the utility was run with the -g option and configured not to demand the password from the user who ran the sudo utility. With this update, the code has been modified and the problem no longer occurs. (BZ#673072) * The sudo utility failed to load sudoers from an LDAP (Lightweight Directory Access Protocol) server after the sudo tool was upgraded. This happened because the upgraded nsswitch.conf file did not contain the instruction to search for sudoers on the LDAP server. This update adds the lost instruction to /etc/nsswitch.conf and the system searches for sources of sudoers on the local file system and then on LDAP, if applicable. (BZ#617061) * The sudo tool interpreted a Runas alias specifying a group incorrectly as a user alias and the alias seemed to be ignored. With this update, the code for interpreting such aliases has been modified and the Runas group aliases are honored as expected. (BZ#627543) * Prior to this update, sudo did not parse comment characters (#) in the ldap.conf file correctly and could fail to work. With this update, parsing of the LDAP configuration file has been modified and the comment characters are parsed correctly. (BZ#750318) * The sudo utility formats its output to fit the width of the terminal window. However, this behavior is undesirable if the output is redirected through a pipeline. With this update, the output formatting is not applied in the scenario described. (BZ#697111) * Previously, the sudo utility performed Security-Enhanced Linux (SELinux) related initialization after switching to an unprivileged user. This prevented the correct setup of the SELinux environment before executing the specified command and could potentially cause an access denial. The bug has been fixed by backporting the SELinux related code and the execution model from a newer version of sudo. (BZ#477185) * On execv(3) function failure, the sudo tool executed an auditing call before reporting the failure. The call reset the error state and, consequently, the tool incorrectly reported that the command succeeded. With this update, the code has been modified and the problem no longer occurs. (BZ#673157) All users of sudo are advised to upgrade to this updated package, which resolves these issues.
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": "An updated sudo package that fixes one security issue and various bugs is\nnow available for Red Hat Enterprise Linux 5.\n\nThe Red Hat Security Response Team has rated this update as having low\nsecurity impact. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available from the CVE link in\nthe References section.",
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        "text": "The sudo (superuser do) utility allows system administrators to give\ncertain users the ability to run commands as root.\n\nA flaw was found in the sudo password checking logic. In configurations\nwhere the sudoers settings allowed a user to run a command using sudo\nwith only the group ID changed, sudo failed to prompt for the user\u0027s\npassword before running the specified command with the elevated group\nprivileges. (CVE-2011-0010)\n\nIn addition, this update fixes the following bugs:\n\n* A NULL pointer dereference bug caused the sudo utility to terminate\nunexpectedly with a segmentation fault. This happened if the utility was\nrun with the -g option and configured not to demand the password from the\nuser who ran the sudo utility. With this update, the code has been modified\nand the problem no longer occurs. (BZ#673072)\n\n* The sudo utility failed to load sudoers from an LDAP (Lightweight\nDirectory Access Protocol) server after the sudo tool was upgraded. This\nhappened because the upgraded nsswitch.conf file did not contain the\ninstruction to search for sudoers on the LDAP server. This update adds the\nlost instruction to /etc/nsswitch.conf and the system searches for sources\nof sudoers on the local file system and then on LDAP, if applicable.\n(BZ#617061)\n\n* The sudo tool interpreted a Runas alias specifying a group incorrectly as\na user alias and the alias seemed to be ignored. With this update, the code\nfor interpreting such aliases has been modified and the Runas group aliases\nare honored as expected. (BZ#627543)\n\n* Prior to this update, sudo did not parse comment characters (#) in the\nldap.conf file correctly and could fail to work. With this update, parsing\nof the LDAP configuration file has been modified and the comment characters\nare parsed correctly. (BZ#750318)\n\n* The sudo utility formats its output to fit the width of the terminal\nwindow. However, this behavior is undesirable if the output is redirected\nthrough a pipeline. With this update, the output formatting is not applied\nin the scenario described. (BZ#697111)\n\n* Previously, the sudo utility performed Security-Enhanced Linux (SELinux)\nrelated initialization after switching to an unprivileged user. This\nprevented the correct setup of the SELinux environment before executing the\nspecified command and could potentially cause an access denial. The bug has\nbeen fixed by backporting the SELinux related code and the execution model\nfrom a newer version of sudo. (BZ#477185)\n\n* On execv(3) function failure, the sudo tool executed an auditing call\nbefore reporting the failure. The call reset the error state and,\nconsequently, the tool incorrectly reported that the command succeeded.\nWith this update, the code has been modified and the problem no longer\noccurs. (BZ#673157)\n\nAll users of sudo are advised to upgrade to this updated package, which\nresolves these issues.",
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        "full_product_name": {
          "name": "sudo-debuginfo-0:1.7.2p1-13.el5.i386 as a component of Red Hat Enterprise Linux (v. 5 server)",
          "product_id": "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.i386"
        },
        "product_reference": "sudo-debuginfo-0:1.7.2p1-13.el5.i386",
        "relates_to_product_reference": "5Server"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "sudo-debuginfo-0:1.7.2p1-13.el5.ia64 as a component of Red Hat Enterprise Linux (v. 5 server)",
          "product_id": "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.ia64"
        },
        "product_reference": "sudo-debuginfo-0:1.7.2p1-13.el5.ia64",
        "relates_to_product_reference": "5Server"
      },
      {
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        "full_product_name": {
          "name": "sudo-debuginfo-0:1.7.2p1-13.el5.ppc as a component of Red Hat Enterprise Linux (v. 5 server)",
          "product_id": "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.ppc"
        },
        "product_reference": "sudo-debuginfo-0:1.7.2p1-13.el5.ppc",
        "relates_to_product_reference": "5Server"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "sudo-debuginfo-0:1.7.2p1-13.el5.s390x as a component of Red Hat Enterprise Linux (v. 5 server)",
          "product_id": "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.s390x"
        },
        "product_reference": "sudo-debuginfo-0:1.7.2p1-13.el5.s390x",
        "relates_to_product_reference": "5Server"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "sudo-debuginfo-0:1.7.2p1-13.el5.x86_64 as a component of Red Hat Enterprise Linux (v. 5 server)",
          "product_id": "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.x86_64"
        },
        "product_reference": "sudo-debuginfo-0:1.7.2p1-13.el5.x86_64",
        "relates_to_product_reference": "5Server"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2011-0010",
      "discovery_date": "2011-01-11T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "668879"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "check.c in sudo 1.7.x before 1.7.4p5, when a Runas group is configured, does not require a password for command execution that involves a gid change but no uid change, which allows local users to bypass an intended authentication requirement via the -g option to a sudo command.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "sudo: does not ask for password on GID changes",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
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          "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.ppc",
          "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.s390x",
          "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2011-0010"
        },
        {
          "category": "external",
          "summary": "RHBZ#668879",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=668879"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2011-0010",
          "url": "https://www.cve.org/CVERecord?id=CVE-2011-0010"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2011-0010",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2011-0010"
        }
      ],
      "release_date": "2011-01-11T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2012-02-21T02:20:00+00:00",
          "details": "Before applying this update, make sure all previously-released errata\nrelevant to your system have been applied.\n\nThis update is available via the Red Hat Network. Details on how to\nuse the Red Hat Network to apply this update are available at\nhttps://access.redhat.com/kb/docs/DOC-11259",
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            "5Client:sudo-0:1.7.2p1-13.el5.ia64",
            "5Client:sudo-0:1.7.2p1-13.el5.ppc",
            "5Client:sudo-0:1.7.2p1-13.el5.s390x",
            "5Client:sudo-0:1.7.2p1-13.el5.src",
            "5Client:sudo-0:1.7.2p1-13.el5.x86_64",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.i386",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.ia64",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.ppc",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.s390x",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.x86_64",
            "5Server:sudo-0:1.7.2p1-13.el5.i386",
            "5Server:sudo-0:1.7.2p1-13.el5.ia64",
            "5Server:sudo-0:1.7.2p1-13.el5.ppc",
            "5Server:sudo-0:1.7.2p1-13.el5.s390x",
            "5Server:sudo-0:1.7.2p1-13.el5.src",
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            "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.ppc",
            "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.s390x",
            "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2012:0309"
        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "HIGH",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 1.2,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:L/AC:H/Au:N/C:N/I:P/A:N",
            "version": "2.0"
          },
          "products": [
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            "5Client:sudo-0:1.7.2p1-13.el5.ia64",
            "5Client:sudo-0:1.7.2p1-13.el5.ppc",
            "5Client:sudo-0:1.7.2p1-13.el5.s390x",
            "5Client:sudo-0:1.7.2p1-13.el5.src",
            "5Client:sudo-0:1.7.2p1-13.el5.x86_64",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.i386",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.ia64",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.ppc",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.s390x",
            "5Client:sudo-debuginfo-0:1.7.2p1-13.el5.x86_64",
            "5Server:sudo-0:1.7.2p1-13.el5.i386",
            "5Server:sudo-0:1.7.2p1-13.el5.ia64",
            "5Server:sudo-0:1.7.2p1-13.el5.ppc",
            "5Server:sudo-0:1.7.2p1-13.el5.s390x",
            "5Server:sudo-0:1.7.2p1-13.el5.src",
            "5Server:sudo-0:1.7.2p1-13.el5.x86_64",
            "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.i386",
            "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.ia64",
            "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.ppc",
            "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.s390x",
            "5Server:sudo-debuginfo-0:1.7.2p1-13.el5.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "sudo: does not ask for password on GID changes"
    }
  ]
}


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