FreeBSD Security Advisory FreeBSD-SA-05:20.cvsbug

From: FreeBSD Security Advisories (security-advisories_at_freebsd.org)
Date: 09/07/05

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    FreeBSD-SA-05:20.cvsbug Security Advisory
                                                              The FreeBSD Project

    Topic: Race condition in cvsbug

    Category: contrib
    Module: contrib_cvs
    Announced: 2005-09-07
    Credits: Marcus Meissner
    Affects: All FreeBSD releases
    Corrected: 2005-09-07 13:43:05 UTC (RELENG_6, 6.0-BETA5)
                    2005-09-07 13:43:23 UTC (RELENG_5, 5.4-STABLE)
                    2005-09-07 13:43:36 UTC (RELENG_5_4, 5.4-RELEASE-p7)
                    2005-09-07 13:43:50 UTC (RELENG_5_3, 5.3-RELEASE-p21)
                    2005-09-07 13:44:06 UTC (RELENG_4, 4.11-STABLE)
                    2005-09-07 13:44:20 UTC (RELENG_4_11, 4.11-RELEASE-p12)
                    2005-09-07 13:44:36 UTC (RELENG_4_10, 4.10-RELEASE-p17)
    CVE Name: CAN-2005-2693

    For general information regarding FreeBSD Security Advisories,
    including descriptions of the fields above, security branches, and the
    following sections, please visit
    <URL:http://www.freebsd.org/security/>.

    I. Background

    cvsbug(1) is a utility for reporting problems in the CVS revision
    control system. It is based on the GNATS send-pr(1) utility.

    II. Problem Description

    A temporary file is created, used, deleted, and then re-created with
    the same name. This creates a window during which an attacker could
    replace the file with a link to another file.

    While cvsbug(1) is based on the send-pr(1) utility, this problem does
    not exist in the version of send-pr(1) distributed with FreeBSD.

    III. Impact

    A local attacker could cause data to be written to any file to which
    the user running cvsbug(1) has write access. This may cause damage in
    itself (e.g., by destroying important system files or documents) or may
    be used to obtain elevated privileges.

    IV. Workaround

    Do not use the cvsbug(1) utility on any system with untrusted users.

    V. Solution

    Perform one of the following:

    1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the
    RELENG_5_4, RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch
    dated after the correction date.

    2) To patch your present system:

    The following patch has been verified to apply to FreeBSD 4.10, 4.11,
    5.3, and 5.4 systems.

    a) Download the relevant patch from the location below, and verify the
    detached PGP signature using your PGP utility.

    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:20/cvsbug.patch
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:20/cvsbug.patch.asc

    b) Execute the following commands as root:

    # cd /usr/src
    # patch < /path/to/patch
    # cd /usr/src/gnu/usr.bin/cvs/cvsbug
    # make obj && make depend && make && make install

    VI. Correction details

    The following list contains the revision numbers of each file that was
    corrected in FreeBSD.

    Branch Revision
      Path
    - -------------------------------------------------------------------------
    RELENG_4
      src/contrib/cvs/src/cvsbug.in 1.1.1.1.2.4
    RELENG_4_11
      src/UPDATING 1.73.2.91.2.13
      src/sys/conf/newvers.sh 1.44.2.39.2.16
      src/contrib/cvs/src/cvsbug.in 1.1.1.1.2.3.2.1
    RELENG_4_10
      src/UPDATING 1.73.2.90.2.18
      src/sys/conf/newvers.sh 1.44.2.34.2.19
      src/contrib/cvs/src/cvsbug.in 1.1.1.1.2.2.6.1
    RELENG_5
      src/contrib/cvs/src/cvsbug.in 1.1.1.3.2.1
    RELENG_5_4
      src/UPDATING 1.342.2.24.2.16
      src/sys/conf/newvers.sh 1.62.2.18.2.12
      src/contrib/cvs/src/cvsbug.in 1.1.1.3.6.1
    RELENG_5_3
      src/UPDATING 1.342.2.13.2.24
      src/sys/conf/newvers.sh 1.62.2.15.2.26
      src/contrib/cvs/src/cvsbug.in 1.1.1.3.4.1
    RELENG_6
      src/contrib/cvs/src/cvsbug.in 1.1.1.3.8.1
    - -------------------------------------------------------------------------

    VII. References

    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2693

    The latest revision of this advisory is available at
    ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:20.cvsbug.asc
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