2021-21830 | AT&T Xmill XML Decompression Load heap-based overflow (TALOS-2021-1293)

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.1	$0-$5k	0.27

A vulnerability was found in AT&T Xmill 0.7. It has been classified as critical. Affected is the function LabelDict::Load of the component XML Decompression Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-122. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A heap-based buffer overflow vulnerability exists in the XML Decompression LabelDict::Load functionality of AT&T Labs’ Xmill 0.7. A specially crafted XMI file can lead to remote code execution. An attacker can provide a malicious file to trigger this vulnerability.

The weakness was disclosed 08/14/2021 as TALOS-2021-1293. The advisory is shared for download at talosintelligence.com. This vulnerability is traded as CVE-2021-21830 since 01/04/2021. The exploitability is told to be easy. It is possible to launch the attack remotely. The successful exploitation requires a authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/18/2021).

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

Vendor

Name

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.3
VulDB Temp Score: 6.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Memory corruption
CWE: CWE-122
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

01/04/2021 CVE assigned
08/14/2021 +221 days Advisory disclosed
08/14/2021 +0 days VulDB entry created
08/18/2021 +4 days VulDB last updateAdvisory: TALOS-2021-1293
Status: Not defined

CVE: CVE-2021-21830 (🔒)

Created: 08/14/2021 08:22
Updated: 08/18/2021 10:09
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍

Comments

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