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Workaround
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Tue, 21 Jul 2026 01:00:00 +0000
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| First Time appeared |
Proftpd
Proftpd proftpd |
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| Vendors & Products |
Proftpd
Proftpd proftpd |
Mon, 20 Jul 2026 17:30:00 +0000
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ssvc
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Mon, 20 Jul 2026 14:45:00 +0000
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| Description | 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. | |
| Title | ProFTPD mod_sftp Signed Integer Overflow via SCP Size-Record Parser | |
| Weaknesses | CWE-126 CWE-190 |
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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-07-21T11:08:17.008Z
Reserved: 2026-07-15T15:45:44.600Z
Link: CVE-2026-63091
Updated: 2026-07-20T16:36:05.774Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-07-21T00:45:05Z