CVE-2026-63091

Katalog CVE

CVSS 6.5 · Medium EPSS 0,53%

Kerentanan Buffer Over-read pada proftpd. Skor CVSS 3.1 6.5 (Medium) menurut vulncheck.com.

Deskripsi (NVD)

ProFTPD before 1.3.9c and 1.3.10rc3 contains a signed integer overflow vulnerability in the mod_sftp module's SCP size-record parser that allows authenticated low-privilege attackers to bypass ASLR by sending a crafted file size value of UINT64_MAX, which results in a negative off_t value. Attackers can exploit the subsequent conversion to uint32_t, causing an approximately 4 GB requested read length and forcing the server to read beyond the end of the SSH channel data and write overread process memory into the uploaded file. In tested configurations, the disclosed data contains libc, libcrypto, and PIE pointers sufficient to derive their randomized base addresses, thereby bypassing ASLR and enabling reliable exploitation of memory corruption vulnerabilities in the same process.

Rincian

Terbit di NVD

20 Juli 2026

Terakhir diubah

30 Juli 2026

Status NVD

Analyzed

CVSS 3.1

6.5 (Medium), sumber vulncheck.com
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-126: Buffer Over-read
CWE-190: Integer Overflow or Wraparound

EPSS (30 hari)

0,53% peluang dieksploitasi; lebih tinggi dari 42,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/proftpd/proftpd/commit/b9b7dde1bcd74bc23366484d53856b67b8d6d95e patch
• https://github.com/proftpd/proftpd/pull/2201 issue tracking · patch
• https://www.vulncheck.com/advisories/proftpd-mod-sftp-signed-integer-overflow-via-scp-size-record-parser patch · release notes · advisory pihak ketiga
• https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES release notes
• https://github.com/proftpd/proftpd/releases/tag/v1.3.10rc3-3 product · release notes
• https://github.com/proftpd/proftpd/releases/tag/v1.3.9c product · release notes