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| APAR (Authorized Program Analysis Report) |
Abstract
OSP-DHCP/FIX CVE-2018-5732 AND CVE-2018-5733 FOR ISC DHCP
Error Description
ISC released CVE-2018-5732 and CVE-2018-5733.
CVE-2018-5732: Failure to properly bounds check a buffer used
for processing DHCP options allows a malicious server (or an
entity masquerading as a server) to cause a buffer overflow (and
resulting crash) in dhclient by sending a response containing a
specially constructed options section.
CVE-2018-5733: A malicious client which is allowed to send very
large amounts of traffic (billions of packets) to a DHCP server
can eventually overflow a 32-bit reference counter, potentially
causing dhcpd to crash.
Problem Summary
****************************************************************
* PROBLEM: (SE69050) Licensed Program = 5770SS1 for i 7.1, *
* i 7.2, and i 7.3 *
* Security *
****************************************************************
* USERS AFFECTED: All IBM i operating system users using *
* integrated application server or integrated *
* web services server. *
****************************************************************
* RECOMMENDATION: Apply PTF SI67242 for i 7.1. *
* Apply PTF SI67240 for i 7.2. *
* Apply PTF SI67239 for i 7.3. *
****************************************************************
ISC released CVE-2018-5732 and CVE-2018-5733.
CVE-2018-5732: Failure to properly bounds check a buffer used
for processing DHCP options allows a malicious server (or an
entity masquerading as a server) to cause a buffer overflow (and
resulting crash) in dhclient by sending a response containing a
specially constructed options section.
CVE-2018-5733: A malicious client which is allowed to send very
large amounts of traffic (billions of packets) to a DHCP server
can eventually overflow a 32-bit reference counter, potentially
causing dhcpd to crash.
Problem Conclusion
Fixed the problems with the ISC-provided fixes.
Note: Please ignore the fix if ISC DHCP server is not used.
Temporary Fix
*********
* HIPER *
*********
Comments
Circumvention
PTFs Available
R710 SI76508 1000
R720 SI67240 8249
R730 SI67239 8242
Affected Modules
Affected Publications
Summary Information
| Status............................................ | CLOSED PER |
| HIPER........................................... | Yes |
| Component.................................. | 5770SS1DN |
| Failing Module.......................... | RCHMGR |
| Reported Release................... | R730 |
| Duplicate Of.............................. |
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Document Information
Modified date:
17 September 2021