{"uuid": "65fe525e-1eb7-4c1a-97c7-f71c2071f0a6", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2020-1938", "type": "seen", "source": "https://gist.github.com/smitstk/c5793aa400af93a2864aac2d45494a53", "content": "\u4ece Nessus \u626b\u63cf\u7ed3\u679c\u91cc\u770b\u5230\u4e00\u6761\u201cApache Tomcat AJP \u6587\u4ef6\u5305\u542b\u6f0f\u6d1e\uff08CVE-2020-1938\uff09\u201d\uff0c\u4fee\u590d\u6307\u5357\u6307\u5411\u4e86 Tomcat 9.0.31 \u4e4b\u540e\u7684\u7248\u672c\u3002\u672c\u6765\u4ee5\u4e3a\u6539\u4e2a\u7248\u672c\u53f7\u91cd\u542f\u5c31\u884c\uff0c\u4f46\u751f\u4ea7\u73af\u5883\u7528\u7684\u65e7\u7248 Java 8 \u5df2\u4e0d\u7ef4\u62a4\uff0c\u5347\u7ea7\u8fc7\u7a0b\u76f4\u63a5\u629b\u4e86\u4e2a `Unsupported major.minor version 52.0` \u2014\u2014 \u8fd9\u662f\u5178\u578b\u7684\u7c7b\u6587\u4ef6\u7248\u672c\u51b2\u7a81\uff0cAJP \u4fee\u6b63\u8fd8\u6ca1\u843d\u5730\uff0cclass \u52a0\u8f7d\u5148\u6302\u4e86\u3002\n\n```swift\nimport Foundation\n\nfunc parseTomcatVersion(from response: String) -> (major: Int, minor: Int)? {\n    let pattern = #\"Apache Tomcat/(\\d+)\\.(\\d+)\"#\n    guard let regex = try? NSRegularExpression(pattern: pattern),\n          let match = regex.firstMatch(in: response, range: NSRange(response.startIndex..., in: response)),\n          let majorRange = Range(match.range(at: 1), in: response),\n          let minorRange = Range(match.range(at: 2), in: response)\n    else { return nil }\n    return (Int(response[majorRange])!, Int(response[minorRange])!)\n}\n```\n\n\u8fd9\u6bb5 Swift \u5de5\u5177\u51fd\u6570\u539f\u672c\u662f\u5185\u90e8\u8d44\u4ea7\u626b\u63cf\u5668\u91cc\u89e3\u6790\u7248\u672c\u53f7\u7684\u7247\u6bb5\uff0c\u62ff\u6765\u9a8c\u8bc1\u5404\u8282\u70b9\u662f\u5426\u771f\u7684\u8dd1\u4e0a\u4e86\u4fee\u590d\u7248\u3002\u7ed3\u679c\u53d1\u73b0\u4e00\u591a\u534a\u8282\u70b9\u8fd8\u5728 9.0.30\uff0c\u9700\u8981\u534f\u540c\u5e73\u53f0\u7ec4\u540c\u6b65\u5347\u7ea7\u2014\u2014\u8fd9\u4ef6\u4e8b\u7684\u5173\u952e\u4e0d\u5728\u4ee3\u7801\uff0c\u800c\u5728\u505c\u673a\u7a97\u53e3\u548c\u56de\u6eda\u9884\u6848\u3002\n\n---\n\n**\u5b9a\u4f4d\u4e0e\u5272\u88c2\u70b9**\n\n\u5347\u7ea7\u8fc7\u7a0b\u5206\u4e09\u6bb5\u8d70\uff1aJDK \u7248\u672c\u5bf9\u9f50\u3001Tomcat \u5c0f\u7248\u672c\u66f4\u65b0\u3001JVM \u53c2\u6570\u9002\u914d\u3002\u5b9e\u8df5\u91cc\u6700\u5927\u7684\u5751\u5176\u5b9e\u662f GC \u65e5\u5fd7\u683c\u5f0f\u53d8\u66f4\u3002Tomcat 8 \u4e4b\u540e\u9ed8\u8ba4\u5bb9\u5668\u53d8\u6210\u4e86 Catalina \u7ebf\u7a0b\u6c60\uff0c\u4f46\u5f88\u591a\u9057\u7559\u914d\u7f6e\u8fd8\u5199\u7740 `maxThreads=\"800\"`\uff0c\u5347\u7ea7\u540e\u76f4\u63a5\u8d85\u7ebf\u7a0b\u6392\u961f\u3002\u5f53\u65f6\u6211\u4eec\u9009\u4e86\u4e00\u53f0\u9884\u53d1\u5e03\u673a\u5668\u505a Canary \u9a8c\u8bc1\uff0c\u7ed3\u679c\u51cc\u6668\u6269\u5bb9\u65f6\u76f4\u63a5\u628a ES \u96c6\u7fa4\u7684\u8fde\u63a5\u6c60\u6253\u6ee1\u3002\n\n\u5c1d\u8bd5\u8fc7\u4ee5\u4e0b\u8def\u7ebf\uff1a\n- \u5148\u4fee JDK \u7248\u672c\uff1a\u4ece Java 8u202 \u8df3\u5230 11.0.23\uff0c\u907f\u5f00 TLS \u534f\u5546\u9519\u8bef\n- \u66ff\u6362 AJP \u8fde\u63a5\u5668\u914d\u7f6e\uff1a\u5c06 `protocol=\"AJP/1.3\"` \u6539\u4e3a `protocol=\"org.apache.coyote.ajp.AjpNioProtocol\"`\n- \u65b0\u589e `-Djdk.tls.client.protocols=TLSv1.2` \u53c2\u6570\u907f\u514d\u63e1\u624b\u964d\u7ea7\n\u6bcf\u4e00\u4e2a\u73af\u8282\u90fd\u53ef\u80fd\u89e6\u53d1\u8fde\u9501\u5931\u6548\uff0c\u7279\u522b\u662f\u5e94\u7528\u5c42 session \u53cd\u5e8f\u5217\u5316\u7b56\u7565\u3002\n\n---\n\n**\u4fee\u590d\u8def\u5f84**\n\n \u56de\u6eda\u5fc5\u987b\u4fdd\u7559\u65e7\u7248 server.xml \u7684 checksum\uff0c\u5426\u5219\u56de\u9000\u540e\u7aef\u53e3\u6620\u5c04\u5168\u4e71\u3002\n\n\u6700\u7ec8\u4e32\u8054\u7684\u64cd\u4f5c\u94fe\u5982\u4e0b\uff1a\n1. \u5148\u5728\u914d\u7f6e\u7ba1\u7406\u5de5\u5177\u91cc\u505a\u57fa\u7ebf\u51bb\u7ed3\uff0c\u65e7\u7248 Tomcat \u5b89\u88c5\u76ee\u5f55\u538b\u7f29\u4e3a tar \u5f52\u6863\n2. \u7528 RPM \u5347\u7ea7 JDK 11\uff0c\u540c\u65f6\u79fb\u9664\u539f\u5148 `-XX:+UseConcMarkSweepGC` \u53c2\u6570\uff08JDK 14 \u540e\u5df2\u5e9f\u5f03\uff09\n3. \u4fee\u6539 `conf/server.xml` \u4e2d AJP \u8fde\u63a5\u5668\u884c\uff0c\u6dfb\u52a0 `secretRequired=\"true\"` \u4e0e `address=\"127.0.0.1\"`\n4. \u91cd\u542f\u524d\u505a socket \u9884\u68c0\uff1a`ss -tlnp | grep java` \u786e\u8ba4 8009 \u53ea\u76d1\u542c\u672c\u5730\n5. \u7070\u5ea6\u4e00\u53f0\u8d1f\u8f7d\u5747\u8861\u540e\u7aef\uff0c\u89c2\u5bdf\u5e94\u7528\u65e5\u5fd7\u65e0 `Caused by: java.lang.ClassNotFoundException` \u518d\u5168\u91cf\u63a8\u9001\n\n\u8865\u5145\u4e00\u70b9\uff1aTomcat 9 \u7684 `conf/Catalina/localhost` \u4e0b XML \u4e0a\u4e0b\u6587\u63cf\u8ff0\u6587\u4ef6\u5982\u679c\u5f15\u7528\u4e86\u65e7\u7248 jar \u8def\u5f84\uff0c\u542f\u52a8\u65f6\u4f1a\u76f4\u63a5\u5ffd\u7565\u8be5\u5e94\u7528\u3002\u8fd9\u662f\u6240\u6709\u4fee\u590d\u91cc\u6700\u5bb9\u6613\u6f0f\u6389\u7684\uff0c\u56e0\u4e3a error log \u53ea\u8f93\u51fa\u4e00\u6761\u201cDeployment skipped\u201d\uff0c\u4e0d raise \u4efb\u4f55\u5f02\u5e38\u3002\n\n---\n\n**\u5c0f\u7ed3\u4e0e\u5ef6\u4f38\u65b9\u5411**\n\n\u6574\u4ef6\u4e8b\u7684\u89e6\u53d1\u70b9\u662f CVE-2020-1938\uff0c\u4f46\u89e3\u51b3\u8fc7\u7a0b\u5b9e\u9645\u66b4\u9732\u4e86\u7ec4\u4ef6\u7248\u672c\u95f4\u9690\u6027\u4f9d\u8d56\u95ee\u9898\u3002\u540e\u7eed\u65b9\u5411\u53ef\u4ee5\u4ece\u4e24\u65b9\u9762\u8ddf\u8fdb\uff1a\u4e00\u662f\u5c06 Tomcat \u8fc1\u79fb\u5230\u5d4c\u5165\u5f0f\u6a21\u5f0f\uff0c\u7ed3\u5408 Spring Boot \u505a\u5355\u4e00 jar \u90e8\u7f72\uff0c\u7531\u535a\u4e1a\u7684\u7ec4\u4ef6\u68c0\u67e5\u5de5\u5177\u53bb\u505a\u6253\u5305\u524d\u7684 bytecode \u7248\u672c\u9884\u68c0\uff1b\u4e8c\u662f\u5728 CI \u6d41\u6c34\u7ebf\u91cc\u52a0\u5165 Tomcat \u6d4b\u8bd5\u5bb9\u5668\u7684\u5185\u6838\u53c2\u6570\u5b89\u5168\u626b\u63cf\uff0c\u8fd9\u6837\u5728\u5bb9\u5668\u5316\u73af\u5883\u91cc\u4e5f\u80fd\u590d\u73b0 GC \u548c\u7ebf\u7a0b\u6c60\u53d8\u5316\u5bf9\u6027\u80fd\u7684\u771f\u5b9e\u5f71\u54cd\u3002\u6f0f\u6d1e\u4fee\u590d\u4ece\u6765\u4e0d\u662f\u6539\u7248\u672c\u53f7\uff0c\u800c\u662f\u6574\u6761\u4ea4\u4ed8\u94fe\u7684\u7248\u672c\u5bf9\u9f50\u3002\n", "creation_timestamp": "2026-07-05T09:09:09.406678Z"}