Denial of Service (DoS) Affecting pyelftools package, versions [0,]
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Test your applications- Snyk ID SNYK-PYTHON-PYELFTOOLS-1579489
- published 12 Sep 2021
- disclosed 1 Sep 2021
- credit pd-fkie
How to fix?
There is no fixed version for pyelftools
.
Overview
pyelftools is a Library for analyzing ELF files and DWARF debugging information
Affected versions of this package are vulnerable to Denial of Service (DoS). This can occur when parsing an ELF file whose e_shentsize
is zero, and e_shnum
is larger than the actual number of entries in the section header table.
The function ELFFile.iter_sections
iterates over i in range(self['e_shnum'])
and yields sections at file offset self['e_shoff'] + i * self['e_shentsize']
. If e_shentsize
is zero this will return the first section over and over again.
Details
Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.
Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.
One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.
When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.
Two common types of DoS vulnerabilities:
High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.
Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm
ws
package