FreeBSD 2.1.5 Z-Modem Protocol privileges management

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in FreeBSD 2.1.5. This issue affects some unknown processing of the component Z-Modem Protocol Handler. Performing a manipulation results in privileges management. This vulnerability was named CVE-1999-1301. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in FreeBSD 2.1.5 (Operating System). This affects some unknown functionality of the component Z-Modem Protocol Handler. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A design flaw in the Z-Modem protocol allows the remote sender of a file to execute arbitrary programs on the client, as implemented in rz in the rzsz module of FreeBSD before 2.1.5, and possibly other programs.

The weakness was presented 07/16/1996 as FreeBSD-SA-96:17 as confirmed advisory (Website). It is possible to read the advisory at ftp.freebsd.org. This vulnerability is uniquely identified as CVE-1999-1301. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at X-Force (7540). Further details are available at ciac.llnl.gov. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/16/1996 🔍
07/16/1996 +0 days 🔍
06/17/2014 +6545 days 🔍
04/16/2026 +4321 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: FreeBSD-SA-96:17
Status: Confirmed

CVE: CVE-1999-1301 (🔍)
GCVE (CVE): GCVE-0-1999-1301
GCVE (VulDB): GCVE-100-13743
X-Force: 7540 - Z-Modem rzsz package allows remote command execution

Misc.: 🔍

Entryinfo

Created: 06/17/2014 17:11
Updated: 04/16/2026 10:13
Changes: 06/17/2014 17:11 (47), 05/18/2018 09:21 (6), 04/03/2025 12:52 (16), 04/16/2026 10:13 (1)
Complete: 🔍
Cache ID: 216::103

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