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Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). CanSecWest 2012 2nd Annual Cyber Security Hack In Paris	Squid's ICAP Implementation Lacks Defer Check When Reading From ICAP Server 11 Dec. 2007    Summary A vulnerability in Squid's ICAP implementation allows attackers to cause Squid to consume large amounts of memory.   Credit: The information has been provided by Martin Huter. The original article can be found at: http://www.squid-cache.org/bugs/show_bug.cgi?id=2136 Website Security Scan Code Vulnerability Test Network Assessment Tool Detect hidden vulnerabilities Exhaustive automated testing Real-time, continuous security Get guidance from professionals of internal or 3rd party code. scanning for your entire network    Details Protect your website! Use an External Vulnerability Scanner! Nothing to install. First report in 1 hour! www.beyondsecurity.com/vulnerability-scanner Vulnerable Systems:  * Squid version 2.5  * Squid version 2.6 Squid's ICAP implementation does not check mem-store size before reading from an ICAP-server. If the user does not confirm browsers download-message-box, Squid keeps on reading data from the ICAP server into the memory store, whilst no more data can be delivered to the client. Thus the memory store is growing and Squid may - in worst case - consume memory up to the size of the users download. Patch: diff -Naur squid-2.5.STABLE10.ICAP.orig/src/icap_respmod.c squid-2.5.STABLE10.ICAP/src/icap_respmod.c --- squid-2.5.STABLE10.ICAP.orig/src/icap_respmod.c 2007-12-07 08:48:14.124859537 +0100 +++ squid-2.5.STABLE10.ICAP/src/icap_respmod.c 2007-12-07 08:49:23.501573696 +0100 @@ -49,6 +49,7 @@  static int icapReadReply2(IcapStateData * icap);  static void icapReadReply3(IcapStateData * icap);  static void write_av_stat(char *virus, char *statsrc, char *statdst); +static int icapCheckDeferRead(int fd, void *data);    #define EXPECTED_ICAP_HEADER_LEN 256  const char *crlf = "\r\n"; @@ -415,7 +416,7 @@      ErrorState *err;      const char *start;      const char *end; - +      debug(81, 5) ("icapRespModReadReply: FD %d data = %p\n", fd, data);      statCounter.syscalls.sock.reads++;   @@ -1100,6 +1102,7 @@      } else if (!icap->flags.no_content) {   /* Wait for EOF condition */   commSetSelect(fd, COMM_SELECT_READ, icapReadReply, icap, 0); + commSetDefer(fd, icapCheckDeferRead, icap);   debug(81,       3)       ("icapReadReply3: Going to read mode data throught icapReadReply\n"); @@ -1134,3 +1137,27 @@   strcat(subsrvProto, statsrc);   send_service_stat(rid, 10, avServer, avService, subsrvProto, virus, statdst, 0, 1, featured);  } + +static int +icapCheckDeferRead(int fd, void *data) +{ + IcapStateData *httpState = data; + StoreEntry *e = httpState->respmod.entry; + MemObject *mem = e->mem_obj; + + int rc=0; + + if (EBIT_TEST(e->flags, ENTRY_FWD_HDR_WAIT)) + return rc; + if (EBIT_TEST(e->flags, RELEASE_REQUEST)) { + if (mem->inmem_hi - mem->inmem_lo > SM_PAGE_SIZE + Config.Store.maxInMemObjSize + READ_AHEAD_GAP){ + debug(81, 5) ("icapCheckDeferRead: Defering read\n"); + return 1; + } + } + if (mem->inmem_hi - storeLowestMemReaderOffset(e) > READ_AHEAD_GAP){ + debug(81, 5) ("icapCheckDeferRead: Defering read\n"); + return 1; + } + return 0; +}  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles ProFTPD Response Pool Use-After-Free Code Execution Vulnerability Insight Control for Linux Multiple Vulnerabilities HP-UX Running NFS/ONCplus Denial of Service Vulnerability HP-UX Running BIND Denial of Service Vulnerability 2011 HP-UX Running XNTP Denial of Service Vulnerability HP-UX Denial of Service Vulnerability Webkit Detached Body Element Code Execution Vulnerability Mac OS X Compact Font Format Decoder Code Execution Vulnerability WebKit WBR Tag Removal Code Execution Vulnerability Webkit Undefined DOM Prototype Attach Code Execution Vulnerability Apple HFS Information Disclosure Vulnerability XPDF arbitrary Arbitrary Code Execution Vulnerabilities Hewlett-Packard Data Protector Client EXEC_CMD omni_chk_ds.sh Code Execution Vulnerability Red Hat OpenJDK IcedTea6 ClassLoader Code Execution Vulnerability HP-UX Apache Running Tomcat Servlet Engine Remote Modification and Denial of Service Vulnerabilities  Featured Articles ProFTPD Response Pool Use-After-Free Code Execution Vulnerability HP Data Protector Notebook Extension LogClientInstallation SQL Injection Vulnerabilty GE Proficy Historian ihDataArchiver.exe Trusted Header Size Code Execution Vulnerability Novell ZENWorks Software Packaging Antique ActiveX Control Code Execution Vulnerability Adobe Reader U3D IFF RGBA Parsing Code Execution Vulnerability Adobe Reader U3D PCX Parsing Code Execution Vulnerability Cisco Unified Service Monitor brstart add_dm Code Execution Vulnerability
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