A vulnerability was found in TCS BaNCS 10

CVE-2025-0202 is a reported file inclusion issue in TCS BaNCS 10, specifically an unknown code path in /REPORTS/REPORTS_SHOW_FILE.jsp where the FilePath argument may control which server-side file gets included or read. The public record only names BaNCS 10; no authoritative vendor advisory, fixed build, or supported affected sub-release range was publicly identified. The CVE record itself also says the *real existence of this vulnerability is still doubted*, which materially weakens confidence in the claim.

The vendor/CNA baseline of MEDIUM 5.5 is already restrained, but in real enterprise conditions this lands lower. The two big brakes are attacker position and credibility: AV:A/PR:L means the adversary likely already has internal/VPN reach and a valid low-privileged session, and the only public technical sourcing is secondary reporting with no vendor fix note, no KEV entry, no public scanner coverage, and no reliable evidence of exploitation. If the flaw is real, it matters to BaNCS operators; for everybody else, this is not remotely comparable to a pre-auth internet-edge banking RCE.

Why this verdict

• Post-initial-access shape: AV:A and PR:L imply the attacker already has internal/VPN reach and an authenticated foothold. That is a real-world downward adjustment from the vendor's 5.5 baseline because it excludes the broad unauthenticated internet population.
• Deployment reach is probably narrow: BaNCS is a large banking platform, but official architecture material shows segmented multi-tier deployments with tightly controlled external-facing subnets and internal segregation. That reduces the fraction of real estates where this JSP is broadly reachable.
• Exploit credibility is weak: the CVE record itself says the vulnerability's existence is doubted, there is no KEV signal, no public vendor advisory, no located patched version, and no scanner plugin coverage. I take another meaningful cut for that uncertainty instead of rewarding a thin report with patch-now urgency.

Why not higher?

There is no evidence of active exploitation, no KEV listing, and no credible sign of broad internet exposure. Most importantly, the public source quality is poor: when the CVE record itself questions whether the bug is real, you do not inflate it into a medium-or-higher operational emergency.

Why not lower?

If the issue is real, arbitrary local file inclusion/read inside a banking application can expose configs, credentials, and sensitive report material that enable lateral movement. BaNCS is also used in high-value financial environments, so a verified exploit on a real deployment would deserve attention even if it remains mostly post-auth/internal.

1. Restrict the reporting JSP path — Limit /REPORTS/REPORTS_SHOW_FILE.jsp to the smallest possible user population and network zones through reverse proxy rules, application ACLs, or internal-only exposure. For a LOW verdict there is no formal mitigation SLA, so treat this as backlog hygiene and fold it into the next control-hardening cycle unless your local validation proves exposure.
2. Hunt for suspicious FilePath usage — Search reverse-proxy, WAF, and app logs for requests to the JSP containing FilePath, traversal tokens, absolute paths, URL-encoded separators, or repeated trial-and-error access patterns. There is no formal mitigation SLA for LOW findings, but this is cheap detection engineering you can add during normal logging work.
3. Constrain web-tier filesystem access — Review the application service account and container/VM filesystem permissions so the web tier cannot read arbitrary configs, keystores, or neighboring app content. For LOW, there is no mitigation SLA; schedule it with routine least-privilege and hardening work.
4. Validate locally before escalating — Run a host-side verification against deployed BaNCS web roots to confirm whether REPORTS_SHOW_FILE.jsp exists and whether it still references FilePath in a risky way. Because this finding has weak public credibility, local proof should drive whether you keep it as backlog hygiene or promote it internally.

Run this on the BaNCS application host or on a mounted exploded WAR/webroot from a build artifact repository. Invoke it as sudo bash verify_cve_2025_0202.sh /opt /u01 /srv /var/www and give it read access to the application directories; root is helpful but not strictly required if the webroot is readable.

#!/usr/bin/env bash
# verify_cve_2025_0202.sh
# Purpose: Host-side verification for suspected CVE-2025-0202 exposure in TCS BaNCS
# Usage: sudo bash verify_cve_2025_0202.sh /opt /u01 /srv /var/www
# Exit codes: 0=PATCHED, 1=VULNERABLE, 2=UNKNOWN

set -u

if [ "$#" -eq 0 ]; then
  echo "UNKNOWN - no search roots supplied"
  echo "Usage: sudo bash $0 /opt /u01 /srv /var/www"
  exit 2
fi

found_any=0
found_vuln=0
found_bancs=0
perm_errors=0

check_file() {
  local f="$1"
  found_any=1

  # Try to detect likely BaNCS context from path or file content
  if echo "$f" | grep -Eiq 'bancs|REPORTS_SHOW_FILE\.jsp'; then
    found_bancs=1
  fi

  if ! [ -r "$f" ]; then
    perm_errors=$((perm_errors+1))
    return
  fi

  # Normalize CRLF just in case and inspect for risky patterns.
  local content
  content="$(tr -d '\r' < "$f" 2>/dev/null)"

  # Heuristic 1: explicit FilePath parameter usage in the JSP
  echo "$content" | grep -Eiq 'FilePath|getParameter\s*\(\s*"FilePath"\s*\)|getParameter\s*\(\s*\x27FilePath\x27\s*\)' || return

  # Heuristic 2: filesystem access / include behavior in same JSP
  if echo "$content" | grep -Eiq 'FileInputStream|new File\(|RequestDispatcher|include\s*\(|jsp:include|getRealPath|BufferedReader|InputStreamReader'; then
    echo "VULNERABLE - suspicious FilePath-driven JSP found: $f"
    found_vuln=1
    return
  fi

  # If FilePath is present but no obvious sink is visible, keep it uncertain.
  echo "UNKNOWN - FilePath reference found but no clear sink in: $f"
}

for root in "$@"; do
  if ! [ -e "$root" ]; then
    continue
  fi

  while IFS= read -r -d '' jsp; do
    check_file "$jsp"
  done < <(find "$root" -type f -name 'REPORTS_SHOW_FILE.jsp' -print0 2>/dev/null)

  # Optional: try to spot general BaNCS evidence for context.
  while IFS= read -r -d '' hit; do
    found_bancs=1
  done < <(find "$root" -maxdepth 5 -type f \( -iname '*bancs*' -o -iname 'MANIFEST.MF' -o -iname 'version.txt' \) -print0 2>/dev/null)
done

if [ "$found_vuln" -eq 1 ]; then
  exit 1
fi

if [ "$found_any" -eq 1 ]; then
  echo "PATCHED - target JSP not found with obvious vulnerable FilePath pattern"
  exit 0
fi

if [ "$perm_errors" -gt 0 ]; then
  echo "UNKNOWN - permission errors prevented inspection"
  exit 2
fi

if [ "$found_bancs" -eq 1 ]; then
  echo "UNKNOWN - BaNCS artifacts seen, but target JSP not located in searched roots"
  exit 2
fi

echo "UNKNOWN - no BaNCS target files found in supplied paths"
exit 2

Sources

1. CVE.org record
2. VulDB entry
3. Tenable CVE page
4. Tenable plugin coverage
5. CISA weekly vulnerability bulletin SB25-006
6. CISA Known Exploited Vulnerabilities catalog
7. Oracle reference architecture for TCS BaNCS on OCI
8. TCS BaNCS Global Banking Platform for Co-operative Banks