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Vulnerability Details : CVE-2021-41253

Zydis is an x86/x86-64 disassembler library. Users of Zydis versions v3.2.0 and older that use the string functions provided in `zycore` in order to append untrusted user data to the formatter buffer within their custom formatter hooks can run into heap buffer overflows. Older versions of Zydis failed to properly initialize the string object within the formatter buffer, forgetting to initialize a few fields, leaving their value to chance. This could then in turn cause zycore functions like `ZyanStringAppend` to make incorrect calculations for the new target size, resulting in heap memory corruption. This does not affect the regular uncustomized Zydis formatter, because Zydis internally doesn't use the string functions in zycore that act upon these fields. However, because the zycore string functions are the intended way to work with the formatter buffer for users of the library that wish to extend the formatter, we still consider this to be a vulnerability in Zydis. This bug is patched starting in version 3.2.1. As a workaround, users may refrain from using zycore string functions in their formatter hooks until updating to a patched version.
Publish Date : 2021-11-08 Last Update Date : 2021-11-15
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- CVSS Scores & Vulnerability Types

CVSS Score
6.8
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) OverflowMemory corruption
CWE ID 122

- Products Affected By CVE-2021-41253

# Product Type Vendor Product Version Update Edition Language
1 Application Zyantific Zydis * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Zyantific Zydis 1

- References For CVE-2021-41253

https://huntr.dev/bounties/d2536d7d-36ce-4723-928c-98d1ee039784
https://github.com/zyantific/zydis/security/advisories/GHSA-q42v-hv86-3m4g CONFIRM
https://huntr.dev/bounties/96b0a482-7041-45b1-9327-c6a4a8f32d3a
https://github.com/zyantific/zydis/commit/55dd08c210722aed81b38132f5fd4a04ec1943b5

- Metasploit Modules Related To CVE-2021-41253

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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