Advisory Details

October 25th, 2022

GnuPG libksba CMS File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-22-1464
ZDI-CAN-18929

CVE ID CVE-2022-3515
CVSS SCORE 8.1, (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS GnuPG
AFFECTED PRODUCTS libksba
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of GnuPG libksba. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the parsing of CMS files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS GnuPG has issued an update to correct this vulnerability. More details can be found at:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1021928
DISCLOSURE TIMELINE
  • 2022-10-04 - Vulnerability reported to vendor
  • 2022-10-25 - Coordinated public release of advisory
CREDIT Anonymous
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