CVE-2009-0641 : Detail

CVE-2009-0641

A05-Security MisconfigurationA01-Broken Access Control
9.03%V3
Network
2009-02-18
16h00 +00:00
2017-09-28
10h57 +00:00
CVE.org
NVD
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CVE Descriptions

sys_term.c in telnetd in FreeBSD 7.0-RELEASE and other 7.x versions deletes dangerous environment variables with a method that was valid only in older FreeBSD distributions, which might allow remote attackers to execute arbitrary code by passing a crafted environment variable from a telnet client, as demonstrated by an LD_PRELOAD value that references a malicious library.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-16 Category : Configuration
Weaknesses in this category are typically introduced during the configuration of the software.
CWE-264 Category : Permissions, Privileges, and Access Controls
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.

Metrics

Metrics Score Severity CVSS Vector Source
V2 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
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EPSS V1
EPSS V2
EPSS V3
10.0010.009.009.008.008.007.007.006.006.007.44%7.44%7.44%7.09%6.46%8.86%8.86%8.34%9.03%Jul '22Jul '2220232023Jul '23Jul '2320242024Jul '24Jul '24
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EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
9696929288888484808081%92%93%93%94%95%94%95%Jul '22Jul '2220232023Jul '23Jul '2320242024Jul '24Jul '24
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EPSS First.org

Exploit information

Exploit Database EDB-ID : 8055

Publication date : 2009-02-15 23h00 +00:00
Author : kingcope
EDB Verified : Yes

FreeBSD (7.0-RELEASE) telnet daemon local privilege escalation -
And possible remote root code excution.
There is a rather big bug in the current FreeBSD telnetd daemon.
The environment is not properly sanitized when execution /bin/login,
what leads to a (possible) remote root hole.
The telnet protocol allows to pass environment variables inside the
telnet traffic and assign them to the other side of the tcp connection.
The telnet daemon of FreeBSD does not check for LD_* (like LD_PRELOAD)
environment variables prior to executing /bin/login.
So passing an environment variable with the identifier LD_PRELOAD and
the value of a precompiled library that is on the filesystem of the
victims box that includes malicious code is possible.
When /bin/login is executed with the user id and group id 0 ('root') it preloads
the library that was set by remote connection through a telnet environment
definition and executes it.
It is unlikely that this bug can be exploited remotely but is not impossible.
An attacker could f.e. upload a malicious library using ftp (including anonymous
ftp users), nfs, smb or any other (file) transfer protocol.
One scenario to exploit the bug remotely would be a ftp server running beside
the telnet daemon serving also anoynmous users with write access. Then the
attacker would upload the malicious library and defines the LD_PRELOAD
 
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Products Mentioned

Configuraton 0

Freebsd>>Freebsd >> Version 7.0

Freebsd>>Freebsd >> Version 7.0

    Freebsd>>Freebsd >> Version 7.0

      Freebsd>>Freebsd >> Version 7.0-release

        Freebsd>>Freebsd >> Version 7.0_beta4

          Freebsd>>Freebsd >> Version 7.0_releng

            Freebsd>>Freebsd >> Version 7.1

            Freebsd>>Freebsd >> Version 7.1

            References

            http://www.securityfocus.com/bid/33777
            Tags : vdb-entry, x_refsource_BID
            https://www.exploit-db.com/exploits/8055
            Tags : exploit, x_refsource_EXPLOIT-DB