[NEWS] BitKeeper Remote Shell Command Execution/Local Vulnerability

From: support@securiteam.com
Date: 01/12/03

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      BitKeeper Remote Shell Command Execution/Local Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.bitkeeper.com/> BitKeeper is a source management software. It
    contains a shell argument parsing vulnerability that leads remote attacker
    to run arbitrary shell commands on system where BitKeeper listens to HTTP
    requests.

    DETAILS

    Vulnerable systems:
     * BitKeeper version 3.0.x

    1. Remote command execution
    BitKeeper may be executed in daemon mode then it opens port and listens to
    incoming requests. BitKeeper provides remote users with access to project
    resources through web interface. It calls external diff binary as a
    parameter to shell -c option which is susceptible to shell metacharacter
    injection.

    2. Locally exploitable race condition
    Second vulnerability is in temporary file handling also during calling
    external programs.

    Piece of strace output:
    20495 getpid() = 20495
    20495 lstat("/tmp/foo.c-1.1-20495", 0xbfffae9c) = -1 ENOENT (No such file
    or directory)
    20495 lstat("/tmp", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=16384, ...}) =
    0
    20495 open("/tmp/foo.c-1.1-20495", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 8

    There is race condition vulnerability after BitKeeper stats the file and
    before the file is opened. Additionally it is created with insecure
    privileges.

    Impact:
    If BitKeeper is running in daemon mode and listens to incoming requests,
    remote attacker can execute arbitrary commands on system with its
    privileges. Further, a local attacker can get access to temporary files
    that may allow him to take over control of the program.

    Vendor Status:
    November 12, 2002 Vendor has been contacted
    November 12, 2002 First answer
    November 27, 2002 Information about pre-release
    December 10, 2002 Last email

    While coordinating date of publishing this advisory, they stopped
    responding to Maurycy's emails.

    Exploit:
    If BitKeeper is run as stand-alone daemon, link:

    http://somehost.com:port/diffs/foo.c@%27;echo%20%3Eiwashere%27?nav=index.html|src/|hist/foo.c

    Should create file named "iwashere" in project root directory.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:z33d@isec.pl> Maurycy
    Prodeus.

    ========================================

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    Relevant Pages

    • BitKeeper remote shell command execution/local vulnerability
      ... BitKeeper is a source management software. ... parsing vulnerability that leads remote attacker to run arbitrary ... shell commands on system where BitKeeper listens to HTTP requests. ... Second vulnerability is in temporary file handling also during calling ...
      (Bugtraq)
    • [VulnWatch] BitKeeper remote shell command execution/local vulnerability
      ... BitKeeper is a source management software. ... parsing vulnerability that leads remote attacker to run arbitrary ... shell commands on system where BitKeeper listens to HTTP requests. ... Second vulnerability is in temporary file handling also during calling ...
      (VulnWatch)