Heap-based buffer overflow in Libgcrypt - CVE-2021-3345

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the _gcry_md_block_write(0 function in cipher/hash-common.c in Libgcrypt. A remote attacker can pass specially crafted data to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Affected software

How to mitigate CVE-2021-3345

Links to Public Exploits and PoC-codes

• Exploit #10182 - CVE-2021-3345 (Actual working exploit for CVE-2021-3345) (July 5, 2024)
• Exploit #5210 - CVE-2021-3345 (POC exploit of CVE-2021-3345, a vulnerability in libgcrypt version 1.9.0) (March 12, 2021)

External References

• https://bugs.gentoo.org/show_bug.cgi?id=767814
• https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=512c0c75276949f13b6373b5c04f7065af750b08
• https://gnupg.org
• https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000455.html
• https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000456.html

Related Security Bulletins

• Remote code execution in Libgcrypt
• Arch Linux update for libgcrypt
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