Fix vuln OSV-2024-382

[aled-ua]

[Warning] This PR is generated by AI

Pull Request Description

---

1. PR Title: Fix for Vulnerability in PcapPlusPlus - OSV-2024-382

2. PR Description:

   • Bug Type: Heap-buffer-overflow
   • Summary: A vulnerability was identified in the PcapPlusPlus library, specifically in the UdpLayer class, where functions were accessing data beyond the bounds of the allocated buffer. This occurred when the buffer size was insufficient for operations involving UDP header fields, leading to a heap-buffer-overflow. The issue was reported in the OSV-2024-382 vulnerability report.
   • Fix Summary: The patch fixes the issue by introducing bounds checks in the following functions:
     • getSrcPort(): Ensures that the buffer length is sufficient before accessing the source port.
     • getDstPort(): Ensures that the buffer length is sufficient before accessing the destination port.
     • computeCalculateFields(): Ensures that the buffer length is sufficient before performing length and checksum calculations.
       These changes ensure that unsafe memory access is avoided, improving both the security and stability of the program.

3. Sanitizer Report Summary:

   • The sanitizer detected a heap-buffer-overflow where the program attempted to read 2 bytes beyond the allocated buffer of size 61. The issue occurred in the UdpLayer class while accessing UDP header fields. The root cause was the lack of bounds checking before accessing these fields, leading to out-of-bounds memory access.

4. Full Sanitizer Report:

   ==87957==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x50600000905d at pc 0x55fb99be6e54 bp 0x7fff22d09870 sp 0x7fff22d09868
   READ of size 2 at 0x50600000905d thread T0
       #0 0x55fb99be6e53 in pcpp::UdpLayer::getSrcPort() const /root/Packet++/src/UdpLayer.cpp:40:10
       #1 0x55fb99be9499 in pcpp::UdpLayer::toString[abi:cxx11]() const /root/Packet++/src/UdpLayer.cpp:161:20
       #2 0x55fb99b6c917 in pcpp::Packet::toStringList(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>>&, bool) const /root/Packet++/src/Packet.cpp:833:31
       #3 0x55fb99b6c527 in pcpp::Packet::toString[abi:cxx11](bool) const /root/Packet++/src/Packet.cpp:821:3
       #4 0x55fb99aafce6 in LLVMFuzzerTestOneInput /root/Tests/Fuzzers/FuzzTarget.cpp:60:17
       #5 0x55fb999ba6d4 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/root/out/FuzzTarget+0xd66d4) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
       #6 0x55fb999a3806 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) (/root/out/FuzzTarget+0xbf806) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
       #7 0x55fb999a92ba in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/root/out/FuzzTarget+0xc52ba) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
       #8 0x55fb999d3a76 in main (/root/out/FuzzTarget+0xefa76) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
       #9 0x7f7a7f0ea1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
       #10 0x7f7a7f0ea28a in __libc_start_main csu/../csu/libc-start.c:360:3
       #11 0x55fb9999e3d4 in _start (/root/out/FuzzTarget+0xba3d4) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
   
   0x50600000905d is located 0 bytes after 61-byte region [0x506000009020,0x50600000905d)
   allocated by thread T0 here:
       #0 0x55fb99aacf21 in operator new[](unsigned long) (/root/out/FuzzTarget+0x1c8f21) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
       #1 0x55fb99aca8c6 in pcpp::PcapFileReaderDevice::getNextPacket(pcpp::RawPacket&) /root/Pcap++/src/PcapFileDevice.cpp:338:28
       #2 0x55fb99ac7e3f in pcpp::IFileReaderDevice::getNextPackets(pcpp::PointerVector<pcpp::RawPacket>&, int) /root/Pcap++/src/PcapFileDevice.cpp:117:22
       #3 0x55fb99aafbf4 in LLVMFuzzerTestOneInput /root/Tests/Fuzzers/FuzzTarget.cpp:46:14
       #4 0x55fb999ba6d4 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/root/out/FuzzTarget+0xd66d4) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
       #5 0x55fb999a3806 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) (/root/out/FuzzTarget+0xbf806) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
       #6 0x55fb999a92ba in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/root/out/FuzzTarget+0xc52ba) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
       #7 0x55fb999d3a76 in main (/root/out/FuzzTarget+0xefa76) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
       #8 0x7f7a7f0ea1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
       #9 0x7f7a7f0ea28a in __libc_start_main csu/../csu/libc-start.c:360:3
       #10 0x55fb9999e3d4 in _start (/root/out/FuzzTarget+0xba3d4) (BuildId: f3b6f7ff5942f35185d0681a33ca22744978264a)
   
   SUMMARY: AddressSanitizer
   

5. Files Modified:

   • Packet++/src/UdpLayer.cpp

   diff --git a/Packet++/src/UdpLayer.cpp b/Packet++/src/UdpLayer.cpp
   index 9cfaa2cb..5158793d 100644
   --- a/Packet++/src/UdpLayer.cpp
   +++ b/Packet++/src/UdpLayer.cpp
   @@ -37,11 +37,19 @@ namespace pcpp
   
   	uint16_t UdpLayer::getSrcPort() const
   	{
   +		if (m_DataLen < sizeof(udphdr)) {
   +			PCPP_LOG_ERROR("Buffer too small to access source port");
   +			return 0; // Return an invalid port number
   +		}
   		return be16toh(getUdpHeader()->portSrc);
   	}
   
   	uint16_t UdpLayer::getDstPort() const
   	{
   +		if (m_DataLen < sizeof(udphdr)) {
   +			PCPP_LOG_ERROR("Buffer too small to access destination port");
   +			return 0; // Return an invalid port number
   +		}
   		return be16toh(getUdpHeader()->portDst);
   	}
   
   @@ -151,6 +159,10 @@ namespace pcpp
   	void UdpLayer::computeCalculateFields()
   	{
   		udphdr* udpHdr = (udphdr*)m_Data;
   +		if (m_DataLen < sizeof(udphdr)) {
   +			PCPP_LOG_ERROR("Buffer too small to calculate fields");
   +			return;
   +		}
   		udpHdr->length = htobe16(m_DataLen);
   		calculateChecksum(true);
   	}

6. Patch Validation: The patch has been validated and confirmed to resolve the issue identified in the sanitizer report. No new bugs were introduced.

7. Links:

   • PoC Binary

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 83.09%. Comparing base (f81ced2) to head (ac92d06).
Report is 17 commits behind head on dev.

Files with missing lines	Patch %	Lines
Packet++/src/UdpLayer.cpp	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1698      +/-   ##
==========================================
- Coverage   83.16%   83.09%   -0.08%     
==========================================
  Files         277      277              
  Lines       48193    48210      +17     
  Branches     9966    10161     +195     
==========================================
- Hits        40081    40060      -21     
- Misses       7234     7263      +29     
- Partials      878      887       +9     

Flag	Coverage Δ
alpine320	75.05% <0.00%> (-0.11%)	⬇️
fedora40	75.11% <0.00%> (-0.09%)	⬇️
macos-13	80.59% <0.00%> (-0.07%)	⬇️
macos-14	80.60% <0.00%> (-0.07%)	⬇️
macos-15	80.57% <0.00%> (-0.07%)	⬇️
mingw32	70.78% <0.00%> (-0.14%)	⬇️
mingw64	70.74% <0.00%> (-0.14%)	⬇️
npcap	85.14% <33.33%> (-0.18%)	⬇️
rhel94	74.94% <0.00%> (-0.09%)	⬇️
ubuntu2004	58.53% <0.00%> (-0.10%)	⬇️
ubuntu2004-zstd	58.65% <0.00%> (-0.10%)	⬇️
ubuntu2204	74.86% <0.00%> (-0.12%)	⬇️
ubuntu2204-icpx	61.41% <0.00%> (-0.03%)	⬇️
ubuntu2404	75.11% <0.00%> (-0.09%)	⬇️
unittest	83.09% <33.33%> (-0.08%)	⬇️
windows-2019	85.24% <33.33%> (-0.11%)	⬇️
windows-2022	85.27% <33.33%> (-0.11%)	⬇️
winpcap	85.24% <33.33%> (-0.10%)	⬇️
xdp	50.51% <0.00%> (-0.02%)	⬇️

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[tigercosmos]

let's move this line at the beginning.