wvu-r7's assessment of CVE-2020-2509

Description

A command injection vulnerability has been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 Build 20210202 and later QTS 4.5.1.1495 Build 20201123 and later QTS 4.3.6.1620 Build 20210322 and later QTS 4.3.4.1632 Build 20210324 and later QTS 4.3.3.1624 Build 20210416 and later QTS 4.2.6 Build 20210327 and later QuTS hero h4.5.1.1491 build 20201119 and later

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wvu-r7 (437)

May 05, 2021 7:09am UTC (3 years ago)•

Ratings

Attacker Value

High

Exploitability

High

Unauthenticated

Technical Analysis

Not sure this is the vuln (and I can’t test it), but it stood out to me because the exec_mount() function no longer calls popen(3)… or much of anything else:

 int32_t exec_mount(int32_t a1, int32_t a2, int32_t a3, int32_t a4, int32_t a5, int32_t a6) {
-    int32_t str3;
-    memset(&str3, 0, (int32_t)&g2);
-    int32_t str4;
-    memset(&str4, 0, (int32_t)&g1);
-    sprintf((char *)&str3, "mount.cifs -o \"username=%s,password=\"%s\",soft,iocharset=utf8,%s%s\" %s %s 2>&1", (char *)a3, (char *)a4, (char *)a5, (char *)a6, (char *)a1, (char *)a2);
-    struct _IO_FILE * stream = popen((char *)&str3, "r");
-    char * str = fgets((char *)&str4, (int32_t)&g265, stream);
-    int32_t result = 0;
-    if (str != NULL) {
-        while (strstr((char *)&str4, (char *)((int32_t)&g177 + 0x109d4)) == NULL) {
-            char * str2 = fgets((char *)&str4, (int32_t)&g265, stream);
-            result = -1;
-            if (str2 == NULL) {
-                goto lab_0x10a14;
-            }
-        }
-        char * found_char_pos = strchr((char *)&str4, 40);
-        result = -13;
-        if (found_char_pos != NULL) {
-            char * str5 = (char *)((int32_t)found_char_pos + 1);
-            *strchr(str5, 41) = 0;
-            sscanf(str5, "%d");
-            result = -1;
-        }
-    }
-  lab_0x10a14:
-    if (stream != NULL) {
-        pclose(stream);
-    }
-    return result;
+    int32_t str;
+    memset(&str, 0, (int32_t)&g2);
+    sprintf((char *)&str, "mount.cifs -o \"username=%s,password=\"%s\",soft,iocharset=utf8,%s%s\" %s %s 2>&1", (char *)a3, (char *)a4, (char *)a5, (char *)a6, (char *)a1, (char *)a2);
+    return 0;
 }

The CIFS_Mount_Speed() function no longer calls system(3) either:

 int32_t CIFS_Mount_Speed(int32_t a1, int32_t a2, int32_t a3, int32_t a4) {
     int32_t str;
     memset(&str, 0, (int32_t)&g1);
     int32_t str2;
-    memset(&str2, 0, (int32_t)&g83);
+    memset(&str2, 0, (int32_t)&g82);
     int32_t v1 = 0;
     int32_t v2;
-    memset(&v2, 0, (int32_t)&g80);
+    memset(&v2, 0, (int32_t)&g79);
     int32_t v3;
     memset(&v3, 0, 128);
     int32_t v4;
     function_3a18((int32_t)((char)v4 == 47) + a2, &v1);
     int32_t v5;
     function_3a18(a3, &v5);
     function_3a18(a4, &v3);
     char * v6 = (char *)a1;
     sprintf((char *)&str, "//%s/%s", v6, &v1);
     sprintf((char *)&str2, "%s/%s/%s/%s", "/mnt/RTRR_CIFS", v6, &v3, &v1);
     int32_t str3;
     sprintf((char *)&str3, "mkdir -p %s", &str2);
-    system((char *)&str3);
     int32_t v7;
-    memcpy(&v7, (int32_t *)((int32_t)&g169 + 0x10bb0), (int32_t)&g90);
+    memcpy(&v7, (int32_t *)((int32_t)&g158 + 0x10a7c), (int32_t)&g89);
     int32_t v8;
-    memcpy(&v8, (int32_t *)((int32_t)&g169 + 0x10df0), 128);
+    memcpy(&v8, (int32_t *)((int32_t)&g158 + 0x10cbc), 128);
     int32_t v9 = &v7;
     int32_t v10 = function_3e20(&str, &str2, a4, &v5, v9, &v8);
     int32_t result = 0;
     while (v10 != 0) {
         int32_t v11;
         int32_t v12 = function_3e20(&str, &str2, a4, &v5, v9, &v11);
         result = 0;
         if (v12 == 0) {
             break;
         }
         v9 += 64;
         if (v9 == (int32_t)&v5) {
             result = -v12;
             return result;
         }
         v10 = function_3e20(&str, &str2, a4, &v5, v9, &v8);
         result = 0;
     }
-  lab_0x10c7c:
+  lab_0x10b6c:
     return result;
 }

function_3e20() above is actually exec_mount(). Sorry about that.

CVSS V3 Severity and Metrics

Data provided by the National Vulnerability Database (NVD)

Base Score:

9.8 Critical

Impact Score:

5.9

Exploitability Score:

3.9

Vector:

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV):

Network

Attack Complexity (AC):

Low

Privileges Required (PR):

None

User Interaction (UI):

None

Scope (S):

Unchanged

Confidentiality (C):

High

Integrity (I):

High

Availability (A):

High

Vendors

qnap

Products

qts,
qts 4.2.6,
qts 4.3.3.0174,
qts 4.3.3.0868,
qts 4.3.3.0998,
qts 4.3.3.1051,
qts 4.3.3.1098,
qts 4.3.3.1161,
qts 4.3.3.1252,
qts 4.3.3.1315,
qts 4.3.3.1386,
qts 4.3.3.1432,
qts 4.3.4.0358,
qts 4.3.4.0370,
qts 4.3.4.0372,
qts 4.3.4.0374,
qts 4.3.4.0387,
qts 4.3.4.0411,
qts 4.3.4.0416,
qts 4.3.4.0427,
qts 4.3.4.0434,
qts 4.3.4.0435,
qts 4.3.4.0451,
qts 4.3.4.0483,
qts 4.3.4.0486,
qts 4.3.4.0506,
qts 4.3.4.0516,
qts 4.3.4.0526,
qts 4.3.4.0551,
qts 4.3.4.0557,
qts 4.3.4.0561,
qts 4.3.4.0569,
qts 4.3.4.0593,
qts 4.3.4.0597,
qts 4.3.4.0604,
qts 4.3.4.0899,
qts 4.3.4.1029,
qts 4.3.4.1082,
qts 4.3.4.1190,
qts 4.3.4.1282,
qts 4.3.4.1368,
qts 4.3.4.1417,
qts 4.3.4.1463,
qts 4.3.6,
qts 4.3.6.0895,
qts 4.3.6.0907,
qts 4.3.6.0923,
qts 4.3.6.0944,
qts 4.3.6.0959,
qts 4.3.6.0979,
qts 4.3.6.0993,
qts 4.3.6.1013,
qts 4.3.6.1033,
qts 4.3.6.1070,
qts 4.3.6.1154,
qts 4.3.6.1218,
qts 4.3.6.1263,
qts 4.3.6.1286,
qts 4.3.6.1333,
qts 4.3.6.1411,
qts 4.3.6.1446,
qts 4.5.1,
qts 4.5.1.1456,
qts 4.5.1.1461,
qts 4.5.1.1465,
qts 4.5.1.1480,
qts 4.5.2,
quts hero,
quts hero h4.5.1,
quts hero h4.5.1.1472

Exploited in the Wild

Reported by:

gwillcox-r7 indicated sources as

Government or Industry Alert (https://www.cisa.gov/known-exploited-vulnerabilities-catalog)
Other: Most Commonly Exploited Vulns 2021 (https://us-cert.cisa.gov/ncas/alerts/aa22-117a)

Reported: April 11, 2022 10:38pm UTC (2 years ago) • Edited 2 years ago

AttackerKB Worker indicated source as Government or Industry Alert (https://www.cisa.gov/news-events/alerts/2022/04/11/cisa-adds-eight-known-exploited-vulnerabilities-catalog)

Reported: November 08, 2024 8:26am UTC (2 weeks ago)

References

Canonical

CVE-2020-2509 (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-2509)

Miscellaneous

https://www.qnap.com/en/security-advisory/qsa-21-05

Rapid7

High

CVE-2020-2509

High

High

None

None

Network

CVE-2020-2509

Description