FreeBSD 7.3/8.0/8.1/8.2/9.0 encrypt.c encrypt_keyid memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.00

A vulnerability has been found in FreeBSD 7.3/8.0/8.1/8.2/9.0 (Operating System) and classified as very critical. This vulnerability affects the function encrypt_keyid of the file telnet/libtelnet/encrypt.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.2 and earlier, Heimdal 1.5.1 and earlier, GNU inetutils, and possibly other products allows remote attackers to execute arbitrary code via a long encryption key, as exploited in the wild in December 2011.

The weakness was shared 12/23/2011 by NighterMan and BatchDrake (Website). The advisory is shared for download at security.freebsd.org. This vulnerability was named CVE-2011-4862 since 12/19/2011. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/15/2024).

A public exploit has been developed by NighterMan/BatchDrake and been published 4 weeks after the advisory. It is possible to download the exploit at syndrowm.com. It is declared as highly functional. As 0-day the estimated underground price was around $100k and more. The vulnerability scanner Nessus provides a plugin with the ID 68412 (Oracle Linux 4 / 5 : krb5 (ELSA-2011-1851)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 216031 (VMware ESX 4.x Several Security Vulnerabilities (VMSA-2012-0006)).

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 12276.

The vulnerability is also documented in the databases at X-Force (71970), Exploit-DB (18280), Zero-Day.cz (353), Tenable (68412) and SecurityFocus (BID 51182†). The entries VDB-4406, VDB-4545, VDB-5529 and VDB-64249 are related to this item.

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CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
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CVSSv2info

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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Author: NighterMan/BatchDrake
Download: 🔍

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Nessus ID: 68412
Nessus Name: Oracle Linux 4 / 5 : krb5 (ELSA-2011-1851)
Nessus File: 🔍
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OpenVAS ID: 70690
OpenVAS Name: Debian Security Advisory DSA 2372-1 (heimdal)
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Saint ID: exploit_info/telnet_server_encrypt_keyid
Saint Name: Telnetd Encryption Key ID Code Execution

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: telnet_encrypt_overflow.rb
MetaSploit Name: Telnet Service Encyption Key ID Overflow Detection
MetaSploit File: 🔍

Exploit-DB: 🔍
Zero-Day.cz: 🔍

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
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Timelineinfo

12/19/2011 🔍
12/23/2011 +4 days 🔍
12/23/2011 +0 days 🔍
12/23/2011 +0 days 🔍
12/23/2011 +0 days 🔍
12/24/2011 +1 days 🔍
12/24/2011 +0 days 🔍
12/26/2011 +2 days 🔍
12/26/2011 +0 days 🔍
12/27/2011 +1 days 🔍
01/01/2012 +5 days 🔍
01/14/2012 +13 days 🔍
01/21/2012 +7 days 🔍
07/12/2013 +538 days 🔍
07/15/2024 +4021 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: security.freebsd.org
Researcher: NighterMan, BatchDrake
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-4862 (🔍)
OVAL: 🔍
IAVM: 🔍

X-Force: 71970 - Multiple products telnetd buffer overflow, High Risk
SecurityFocus: 51182 - FreeBSD 'telnetd' Daemon Remote Buffer Overflow Vulnerability
Secunia: 47341 - Debian update for krb5 and krb5-appl, Highly Critical
OSVDB: 78020
SecurityTracker: 1026460 - FreeBSD Telnet Encryption Feature Buffer Overflow Lets Remote Users Execute Arbitrary Code
Vulnerability Center: 34154 - [cisco-sa-20120126-ironport] Telnetd libtelnet/encrypt.c Remote Buffer Overflow Allows Code Execution via Long Encryption Key, Critical

scip Labs: https://www.scip.ch/en/?labs.20161013
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Entryinfo

Created: 01/21/2012 01:00 AM
Updated: 07/15/2024 09:23 PM
Changes: 01/21/2012 01:00 AM (98), 04/09/2017 01:13 PM (17), 03/20/2021 10:28 AM (2), 06/27/2024 06:32 PM (15), 07/15/2024 09:23 PM (9)
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Cache ID: 18:DF8:40

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