UPX p_lx_elf.cpp invert_pt_dynamic divide by zero

HistoryDiffrelatejsonxmlCTI

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.
4.8	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in UPX and classified as problematic. The impacted element is the function PackLinuxElf64::invert_pt_dynamic of the file p_lx_elf.cpp. The manipulation leads to divide by zero. This vulnerability is documented as CVE-2020-27790. The attack can be initiated remotely. There is not any exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in UPX (the affected version unknown). This issue affects the function PackLinuxElf64::invert_pt_dynamic of the file p_lx_elf.cpp. The manipulation with an unknown input leads to a divide by zero vulnerability. Using CWE to declare the problem leads to CWE-369. The product divides a value by zero. Impacted is availability. The summary by CVE is:

A floating point exception issue was discovered in UPX in PackLinuxElf64::invert_pt_dynamic() function of p_lx_elf.cpp file. An attacker with a crafted input file could trigger this issue that could cause a crash leading to a denial of service. The highest impact is to Availability.

The weakness was released 08/19/2022 as 331. The advisory is shared at github.com. The identification of this vulnerability is CVE-2020-27790 since 10/27/2020. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Applying the patch eb90eab6325d009004ffb155e3e33f22d4d3ca26 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Name

License

free

Website

Product: https://github.com/upx/upx/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Divide by zero
CWE: CWE-369 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: eb90eab6325d009004ffb155e3e33f22d4d3ca26

Timelineinfo

10/27/2020 🔍
08/19/2022 +660 days 🔍
08/19/2022 +0 days 🔍
04/11/2025 +966 days 🔍

Sourcesinfo

Product: github.com

Advisory: 331
Status: Confirmed

CVE: CVE-2020-27790 (🔍)
GCVE (CVE): GCVE-0-2020-27790
GCVE (VulDB): GCVE-100-206741

Entryinfo

Created: 08/19/2022 08:07
Updated: 04/11/2025 15:35
Changes: 08/19/2022 08:07 (41), 09/18/2022 09:59 (11), 04/11/2025 15:35 (15)
Complete: 🔍
Cache ID: 216::103