Heap-based Buffer Overflow in Libgcrypt by GnuPG
CVE-2021-3345

7.8HIGH

Key Information:

Vendor

Gnupg

Status
Libgcrypt
Vendor
CVE Published:
29 January 2021

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-3345?

The function _gcry_md_block_write in Libgcrypt version 1.9.0 is prone to a heap-based buffer overflow. This vulnerability arises when a large count value is set during the digest final operation. Exploiting this weakness could potentially lead to unauthorized access or manipulation of the system. Users are strongly advised to upgrade to version 1.9.1 or later to ensure system integrity.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-3345
Created by MLGRadish

CVE-2021-3345
Created by SpiralBL0CK

References

https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%...
x_refsource_MISC
https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/0...
x_refsource_MISC
https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/0...
x_refsource_MISC

EPSS Score

5% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.