165 lines
6.7 KiB
JSON
165 lines
6.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-7828",
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"assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
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"state": "PUBLISHED",
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"assignerShortName": "securin",
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"dateReserved": "2026-05-05T03:40:50.298Z",
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"datePublished": "2026-07-01T03:33:21.648Z",
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"dateUpdated": "2026-07-09T04:36:02.166Z"
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},
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"containers": {
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"cna": {
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"title": "UltraVNC repeater integer overflow in win_log malloc leading to heap overflow",
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"descriptions": [
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{
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"lang": "en",
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"value": "UltraVNC repeater through 1.8.2.2 contains an integer overflow in the HTTP request logging path. In repeater/webgui/settings.c:336, the win_log() function allocates list nodes via malloc(sizeof(struct LIST) + strlen(line)), where line is derived from HTTP request URIs. If strlen(line) is sufficiently large, the addition overflows to a value smaller than sizeof(struct LIST), causing a heap allocation smaller than required. The subsequent strcpy of the full string into the undersized allocation produces a heap buffer overflow. In the current implementation this overflow is bounded by the HTTP receive buffer size (WI_RXBUFSIZE = 153600 bytes, well below SIZE_MAX on 32-bit builds), limiting practical exploitability to a partial heap write. A remote unauthenticated attacker can trigger the theoretical overflow path by sending a maximally-sized URI in an HTTP request to the repeater HTTP port."
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}
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],
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"affected": [
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{
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"vendor": "uvnc",
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"product": "UltraVNC",
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"versions": [
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{
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"version": "0",
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"lessThanOrEqual": "1.8.2.2",
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"status": "affected",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unaffected",
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"modules": [
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"repeater"
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"type": "CWE",
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"cweId": "CWE-190",
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"lang": "en",
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"description": "Integer Overflow or Wraparound"
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}
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]
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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],
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "LOW",
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"baseScore": 5.3,
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"baseSeverity": "MEDIUM"
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}
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}
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],
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"references": [
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{
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"url": "https://uvnc.com/",
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"name": "UltraVNC project page",
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"tags": [
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"vendor-advisory"
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]
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},
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{
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"url": "https://github.com/ultravnc/UltraVNC",
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"name": "UltraVNC source repository",
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"tags": [
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"product"
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]
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},
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{
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"url": "https://www.securin.io/zero-days/cve-2026-7828-integer-overflow-win-log-malloc-ultravnc-repeater"
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}
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],
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"timeline": [
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{
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"time": "2026-06-02T00:00:00.000Z",
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"lang": "en",
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"value": "Vulnerability discovered during security audit"
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},
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{
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"time": "2026-06-17T00:00:00.000Z",
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"lang": "en",
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"value": "Reported to vendor (coordinated disclosure)"
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},
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{
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"time": "2026-09-15T00:00:00.000Z",
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"lang": "en",
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"value": "Planned public disclosure (90-day window)"
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "Arjun Basnet, Securin (arjun.basnet@securin.io)",
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"type": "finder"
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}
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],
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"source": {
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"discovery": "EXTERNAL",
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"advisory": "Securin Security Advisory — FINDING-009"
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},
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"providerMetadata": {
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"orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
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"shortName": "securin",
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"dateUpdated": "2026-07-09T04:36:02.166Z"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-07-01T13:14:15.623029Z",
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"id": "CVE-2026-7828",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-07-01T13:14:25.539Z"
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}
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}
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]
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}
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} |