ISC Lynx 2.8.3/2.8.4/2.8.6/2.8.6 Dev13 NNTP Header HTrjis stack-based overflow

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6.6$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in ISC Lynx 2.8.3/2.8.4/2.8.6/2.8.6 Dev13. Affected by this vulnerability is the function HTrjis of the component NNTP Header Handler. Performing a manipulation results in stack-based overflow. This vulnerability is known as CVE-2005-3120. Remote exploitation of the attack is possible. Furthermore, an exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in ISC Lynx 2.8.3/2.8.4/2.8.6/2.8.6 Dev13 (Web Browser). It has been classified as critical. This affects the function HTrjis of the component NNTP Header Handler. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Stack-based buffer overflow in the HTrjis function in Lynx 2.8.6 and earlier allows remote NNTP servers to execute arbitrary code via certain article headers containing Asian characters that cause Lynx to add extra escape (ESC) characters.

The bug was discovered 10/17/2005. The weakness was published 10/17/2005 by Ulf Harnhammar with Debian (Website). It is possible to read the advisory at ftp.sco.com. This vulnerability is uniquely identified as CVE-2005-3120 since 10/03/2005. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

The exploit is shared for download at securiteam.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 21863 (CentOS 3 / 4 : lynx (CESA-2005:803)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 117823 (CentOS Security Update for Lynx (CESA-2005:803)).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at lynx.isc.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (22755), Exploit-DB (1256), Tenable (21863), SecurityFocus (BID 15117†) and OSVDB (20019†). Similar entry is available at VDB-26124. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 21863
Nessus Name: CentOS 3 / 4 : lynx (CESA-2005:803)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 56855
OpenVAS Name: Debian Security Advisory DSA 1085-1 (lynx-ssl)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: lynx.isc.org
Suricata ID: 100000172
Suricata Class: 🔍
Suricata Message: 🔍

Timelineinfo

10/03/2005 🔍
10/17/2005 +14 days 🔍
10/17/2005 +0 days 🔍
10/17/2005 +0 days 🔍
10/17/2005 +0 days 🔍
10/17/2005 +0 days 🔍
10/17/2005 +0 days 🔍
10/17/2005 +0 days 🔍
10/17/2005 +0 days 🔍
10/23/2005 +5 days 🔍
10/27/2005 +4 days 🔍
01/25/2006 +90 days 🔍
07/03/2006 +159 days 🔍
06/29/2025 +6936 days 🔍

Sourcesinfo

Vendor: isc.org

Advisory: ftp.sco.com
Researcher: Ulf Harnhammar
Organization: Debian
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2005-3120 (🔍)
GCVE (CVE): GCVE-0-2005-3120
GCVE (VulDB): GCVE-100-1815

OVAL: 🔍

X-Force: 22755
SecurityFocus: 15117 - Lynx NNTP Article Header Buffer Overflow Vulnerability
Secunia: 18584 - Avaya S87XX/S8500/S8300 Lynx "HTrjis()" NNTP Buffer Overflow, Highly Critical
OSVDB: 20019 - Lynx NNTP HTrjis() Function Remote Overflow
SecurityTracker: 1015065
SecuriTeam: securiteam.com
Vulnerability Center: 9435 - Buffer Overflow in Lynx via Malicious NNTP Servers, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 10/17/2005 16:31
Updated: 06/29/2025 09:57
Changes: 10/17/2005 16:31 (109), 07/04/2019 18:37 (1), 01/20/2025 01:35 (15), 06/29/2025 09:57 (2)
Complete: 🔍
Cache ID: 216:217:103

Be aware that VulDB is the high quality source for vulnerability data.

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