Stack buffer overflow in PKCS7 SignedData encoding with custom signed attributes
概要
Stack buffer overflow in PKCS7 SignedData encoding with custom signed attributes
原文の説明
取得元が公開している説明をそのまま載せています (多くは英語)。
A stack buffer overflow vulnerability exists in wolfSSL's PKCS7 SignedData encoding functionality. In wc_PKCS7_BuildSignedAttributes(), when adding custom signed attributes, the code passes an incorrect capacity value (esd->signedAttribsCount) to EncodeAttributes() instead of the remaining available space in the fixed-size signedAttribs[7] array. When an application sets pkcs7->signedAttribsSz to a value greater than MAX_SIGNED_ATTRIBS_SZ (default 7) minus the number of default attributes already added, EncodeAttributes() writes beyond the array bounds, causing stack memory corruption. In WOLFSSL_SMALL_STACK builds, this becomes heap corruption. Exploitation requires an application that allows untrusted input to control the signedAttribs array size when calling wc_PKCS7_EncodeSignedData() or related signing functions.
ディストリビューション別の修正状況
各ディストリビューションが公開している、この CVE の修正パッケージ
- Debian DEBIAN-CVE-2026-0819 wolfssl
- Ubuntu UBUNTU-CVE-2026-0819 wolfssl
参照URL
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com