Cisco Linksys WRT120N Firmware 1.0.07 fprintf memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

A vulnerability classified as critical has been found in Cisco Linksys WRT120N Firmware 1.0.07 (Router Operating System). This affects the function fprintf. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was presented 02/19/2014 by Craig Heffner with /dev/ttyS0 as WRT120N fprintf Stack Overflow as confirmed blog post (Blog). The advisory is shared at devttys0.com. The exploitability is told to be easy. The attack can only be done within the local network. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

A public exploit has been developed by Craig Heffner in Python and been published immediately after the advisory. The exploit is shared for download at github.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $25k-$100k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (91645) and Exploit-DB (31758).

Productinfo

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Support

  • end of life (old version)

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Local: No
Remote: Partially

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Craig Heffner
Programming Language: 🔍
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

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Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
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Timelineinfo

02/19/2014 🔍
02/19/2014 +0 days 🔍
02/19/2014 +0 days 🔍
02/27/2014 +8 days 🔍
03/13/2014 +14 days 🔍
05/17/2018 +1526 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: WRT120N fprintf Stack Overflow
Researcher: Craig Heffner
Organization: /dev/ttyS0
Status: Confirmed
X-Force: 91645 - Linksys WRT120N fprintf() buffer overflow, Medium Risk
Secunia: 57040 - Linksys WRT120N "fprintf()" Buffer Overflow Vulnerability, Moderately Critical

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

Entryinfo

Created: 03/13/2014 12:42
Updated: 05/17/2018 08:48
Changes: 03/13/2014 12:42 (58), 05/17/2018 08:48 (1)
Complete: 🔍
Committer: olku

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