PT-2009-3282 · Freebsd · Freebsd

Kingcope + 1 · Published 2009-02-18 · Updated 2017-09-29 · CVE-2009-0641

Positive Technologies (AI Summary)

CVSS v2.0

9.3

High

Base vector

AV:N/AC:M/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions FreeBSD versions 7.0 through 7.x

Description The issue arises from the way sys term.c in telnetd handles environment variables. Specifically, it uses a method to delete dangerous environment variables that was valid only in older FreeBSD distributions. This could allow remote attackers to execute arbitrary code by passing a crafted environment variable from a telnet client. For example, an attacker could pass an LD PRELOAD value that references a malicious library.

Recommendations For FreeBSD versions 7.0 through 7.x, update to a version that uses a secure method to handle environment variables, ensuring that dangerous variables are properly deleted to prevent arbitrary code execution.

Exploit

Fix

Weakness Enumeration

CWE-264

CWE-16

Related Identifiers

CVE-2009-0641

Affected Products

Freebsd

References · 6

• 🔥 http://lists.grok.org.uk/pipermail/full-disclosure/2009-February/067954.html · Exploit
• 🔥 https://exploit-db.com/exploits/8055 · Exploit
• 🔥 http://securityfocus.com/bid/33777 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2009-0641 · Security Note
• https://exchange.xforce.ibmcloud.com/vulnerabilities/48780 · Note
• http://security.freebsd.org/advisories/FreeBSD-SA-09:05.telnetd.asc · Patch, Vendor Advisory