rhsa-2012_1149
Vulnerability from csaf_redhat
Published
2012-08-07 16:49
Modified
2024-11-22 05:20
Summary
Red Hat Security Advisory: sudo security and bug fix update

Notes

Topic
An updated sudo package that fixes one security issue and several bugs is now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having moderate 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. An insecure temporary file use flaw was found in the sudo package's post-uninstall script. A local attacker could possibly use this flaw to overwrite an arbitrary file via a symbolic link attack, or modify the contents of the "/etc/nsswitch.conf" file during the upgrade or removal of the sudo package. (CVE-2012-3440) This update also fixes the following bugs: * Previously, sudo escaped non-alphanumeric characters in commands using "sudo -s" or "sudo -" at the wrong place and interfered with the authorization process. Some valid commands were not permitted. Now, non-alphanumeric characters escape immediately before the command is executed and no longer interfere with the authorization process. (BZ#844418) * Prior to this update, the sudo utility could, under certain circumstances, fail to receive the SIGCHLD signal when it was executed from a process that blocked the SIGCHLD signal. As a consequence, sudo could become suspended and fail to exit. This update modifies the signal process mask so that sudo can exit and sends the correct output. (BZ#844419) * The sudo update RHSA-2012:0309 introduced a regression that caused the Security-Enhanced Linux (SELinux) context of the "/etc/nsswitch.conf" file to change during the installation or upgrade of the sudo package. This could cause various services confined by SELinux to no longer be permitted to access the file. In reported cases, this issue prevented PostgreSQL and Postfix from starting. (BZ#842759) * Updating the sudo package resulted in the "sudoers" line in "/etc/nsswitch.conf" being removed. This update corrects the bug in the sudo package's post-uninstall script that caused this issue. (BZ#844420) * Prior to this update, a race condition bug existed in sudo. When a program was executed with sudo, the program could possibly exit successfully before sudo started waiting for it. In this situation, the program would be left in a zombie state and sudo would wait for it endlessly, expecting it to still be running. (BZ#844978) All users of sudo are advised to upgrade to this updated package, which contains backported patches to correct 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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        "text": "An updated sudo package that fixes one security issue and several bugs is\nnow available for Red Hat Enterprise Linux 5.\n\nThe Red Hat Security Response Team has rated this update as having moderate\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\nAn insecure temporary file use flaw was found in the sudo package\u0027s\npost-uninstall script. A local attacker could possibly use this flaw to\noverwrite an arbitrary file via a symbolic link attack, or modify the\ncontents of the \"/etc/nsswitch.conf\" file during the upgrade or removal of\nthe sudo package. (CVE-2012-3440)\n\nThis update also fixes the following bugs:\n\n* Previously, sudo escaped non-alphanumeric characters in commands using\n\"sudo -s\" or \"sudo -\" at the wrong place and interfered with the\nauthorization process. Some valid commands were not permitted. Now,\nnon-alphanumeric characters escape immediately before the command is\nexecuted and no longer interfere with the authorization process.\n(BZ#844418)\n\n* Prior to this update, the sudo utility could, under certain\ncircumstances, fail to receive the SIGCHLD signal when it was executed\nfrom a process that blocked the SIGCHLD signal. As a consequence, sudo\ncould become suspended and fail to exit. This update modifies the signal\nprocess mask so that sudo can exit and sends the correct output.\n(BZ#844419)\n\n* The sudo update RHSA-2012:0309 introduced a regression that caused the\nSecurity-Enhanced Linux (SELinux) context of the \"/etc/nsswitch.conf\" file\nto change during the installation or upgrade of the sudo package. This\ncould cause various services confined by SELinux to no longer be permitted\nto access the file. In reported cases, this issue prevented PostgreSQL and\nPostfix from starting. (BZ#842759)\n\n* Updating the sudo package resulted in the \"sudoers\" line in\n\"/etc/nsswitch.conf\" being removed. This update corrects the bug in the\nsudo package\u0027s post-uninstall script that caused this issue. (BZ#844420)\n\n* Prior to this update, a race condition bug existed in sudo. When a\nprogram was executed with sudo, the program could possibly exit\nsuccessfully before sudo started waiting for it. In this situation, the\nprogram would be left in a zombie state and sudo would wait for it\nendlessly, expecting it to still be running. (BZ#844978)\n\nAll users of sudo are advised to upgrade to this updated package, which\ncontains backported patches to correct these issues.",
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      "cwe": {
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        "name": "Time-of-check Time-of-use (TOCTOU) Race Condition"
      },
      "discovery_date": "2012-07-19T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "844442"
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      "notes": [
        {
          "category": "description",
          "text": "A certain Red Hat script for sudo 1.7.2 on Red Hat Enterprise Linux (RHEL) 5 allows local users to overwrite arbitrary files via a symlink attack on the /var/tmp/nsswitch.conf.bak temporary file.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "sudo: insecure temporary file use in RPM %postun script",
          "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"
        }
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2012-3440",
          "url": "https://www.cve.org/CVERecord?id=CVE-2012-3440"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2012-3440",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2012-3440"
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "sudo: insecure temporary file use in RPM %postun script"
    }
  ]
}


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