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Apache Log4j2 远程代码执行漏洞

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  • TA的每日心情
    奋斗
    昨天 10:07
  • 签到天数: 2385 天

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    发表于 2021-12-15 10:10:25 | 只看该作者 |只看大图 回帖奖励 |倒序浏览 |阅读模式
    漏洞描述

    Apache Log4j2 是一个基于 Java 的日志记录工具。该工具重写了 Log4j 框架,并且引入了大量丰富的特性。该日志框架被大量用于业务系统开发,用来记录日志信息。

    在大多数情况下,开发者可能会将用户输入导致的错误信息写入日志中。攻击者利用此特性可通过该漏洞构造特殊的数据请求包,最终触发远程代码执行。由于该漏洞影响范围极广,建议广大用户及时排查相关漏洞,经过白帽汇安全研究院分析确认,目前市面有多款流行的系统都受影响。

    该漏洞危害等级:严重

    影响范围

    Apache Log4j 2.x < 2.15.0-rc2

    已知影响组件
    • Apache Struts2
    • Apache Solr
    • Apache Flink
    • Apache Druid
    • flume
    • dubbo
    • logstash
    • VMware Horizon
    • VMware vCenter Server
    • VMware HCX
    • VMware NSX-T Data Center
    • VMware Unified Access Gateway
    • VMware WorkspaceOne Access
    • VMware Identity Manager`
    • VMware vRealize Operations
    • VMware vRealize Operations Cloud Proxy
    • VMware vRealize Log Insight
    • VMware vRealize Automation
    • VMware vRealize Lifecycle Manager
    • VMware Telco Cloud Automation
    • VMware Site Recovery Manager
    • VMware Carbon Black Cloud Workload Appliance
    • VMware Carbon Black EDR Server
    • VMware Tanzu GemFire
    • VMware Tanzu Greenplum
    • VMware Tanzu Operations Manager
    • VMware Tanzu Application Service for VMs
    • VMware Tanzu Kubernetes Grid Integrated Edition
    • VMware Tanzu Observability by Wavefront Nozzle
    • Healthwatch for Tanzu Application Service
    • Spring Cloud Services for VMware Tanzu
    • Spring Cloud Gateway for VMware Tanzu
    • Spring Cloud Gateway for Kubernetes
    • API Portal for VMware Tanzu
    • Single Sign-On for VMware Tanzu Application Service
    • App Metrics
    • VMware vCenter Cloud Gateway
    • VMware Tanzu SQL with MySQL for VMs
    • VMware vRealize Orchestrator
    • VMware Cloud Foundation
    • VMware Workspace ONE Access Connector
    • VMware Horizon DaaS
    • VMware Horizon Cloud Connector
      ( c( O' Q) b7 P5 o( j
    受影响开源组件
    项目
    仓库地址
    版本
    ' ?) w" o0 ~) M. X8 i% S. C! ]2 b$ T  _
    elasticsearch(org.elasticsearch)https://github.com/elastic/elasticsearch8.0.0-alpha2 等(共 100 个)
    " U* n' p1 t* g5 kspring-webflux(org.springframework)https://github.com/spring-projects/spring-framework5.2.6.RELEASE 等(共 40 个)
    ! ~8 O5 g) i9 K/ e6 x  fdruid(com.alibaba)https://github.com/alibaba/druid1.2.8 等(共 68 个)+ g8 C' l3 y( d3 N& b
    hystrix-rx-netty-metrics-stream(com.netflix.hystrix)https://github.com/Netflix/Hystrix1.5.4 等(共 2 个)0 G* A+ R; ?- k- A* d6 U% c; q+ A
    spring-cloud-starter-alibaba-sentinel(com.alibaba.cloud)https://github.com/alibaba/spring-cloud-alibaba2021.1 等(共 14 个)
    3 K( k+ g9 z: K) Q: ^. Ispring-boot-starter-ahas-sentinel-client(com.alibaba.csp)https://github.com/alibaba/Sentinel1.3.2 等(共 17 个)
    7 z/ }$ Y9 J/ I3 C* Lredisson(org.redisson)https://github.com/redisson/redisson2.2.24 等(共 3 个)' q4 P* F' p8 N# v; x
    HikariCP(com.zaxxer)https://github.com/brettwooldridge/HikariCP5.0.0 等(共 27 个)
    " ]* O. o& S* Xzipkin-collector-service(io.zipkin)https://github.com/openzipkin/zipkin1.40.2 等(共 27 个)
    1 v7 l4 D& j+ C6 a; Xmybatis-plus(com.baomidou)https://github.com/baomidou/mybatis-plus3.4.3.4 等(共 41 个)
    , y) |& u7 h( H* I: [( a# Uzuul-sample(com.netflix.zuul)https://github.com/Netflix/zuul2.3.0 等(共 10 个)
    1 }6 W- a' [1 I: _watson-data-api-client(com.ibm.watson.data)https://github.com/OpenAPITools/openapi-generator0.1 等(共 1 个)* J- u/ H3 T# f* l$ K6 K" k
    spring-boot-admin-sample-consul(de.codecentric)https://github.com/codecentric/spring-boot-admin2.5.4 等(共 40 个)- i/ p2 X! X- f9 {
    jedis(redis.clients)https://github.com/redis/jedisjedis-3.6.2 等(共 36 个)
    6 W$ V$ k: o+ s+ w! V. e2 igrpc-benchmarks(io.grpc)https://github.com/grpc/grpc-java1.9.1 等(共 65 个)2 g2 l9 f1 ]7 B4 W# w
    ktor-client-json-tests(io.ktor)https://github.com/ktorio/ktor1.6.7 等(共 32 个)) h$ C4 n& f4 `7 ]6 k9 H
    gitbucket_2.13(io.github.gitbucket)https://github.com/gitbucket/gitbucket4.32.0 等(共 27 个): p5 Z( n6 [7 N2 u& M1 I7 b
    finagle-zipkin_2.12(com.twitter)https://github.com/twitter/finagle7.1.0 等(共 56 个)
    0 Z  q$ c& S8 A! Cresilience4j-vertx(io.github.resilience4j)https://github.com/resilience4j/resilience4j0.9.0 等(共 9 个). h0 E* e* q0 A+ _& [) N
    elasticsearch-sql(org.nlpcn)https://github.com/NLPchina/elasticsearch-sql6.8.13.0 等(共 9 个)7 B$ G; V8 G7 a, Q. y
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    1 I' a& g, O- o7 tnetty-socketio(com.corundumstudio.socketio)https://github.com/mrniko/netty-socketio1.7.19 等(共 8 个)
    & C0 y6 B0 a; d8 V* b0 [. Rspringfox-swagger2(io.springfox)https://github.com/springfox/springfox2.10.5 等(共 6 个)  x5 H. c$ w/ v0 t8 s
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    corda-webserver-impl(net.corda)https://github.com/corda/cordacorda-3.0 等(共 32 个)/ \1 F+ Q4 ?- g" `0 Y
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    armeria(com.linecorp.armeria)https://github.com/line/armeria0.26.1.Final 等(共 2 个)+ P) p" ^* ~. I' R
    breeze-parent_2.13(org.scalanlp)https://github.com/scalanlp/breeze2.0.1-RC1 等(共 5 个)2 K2 d! y8 X( a
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    $ [1 D# C: Z( i, d; L% A% talink_connector_jdbc_sqlite_flink-1.9_2.11(com.alibaba.alink)https://github.com/alibaba/Alink1.5.1 等(共 3 个)0 V% G! _5 }5 U2 t5 V8 a
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    7 c0 Z# i- k7 Z" I- J; R  T( ]telegrambots-spring-boot-starter(org.telegram)https://github.com/rubenlagus/TelegramBots4.9.1 等(共 17 个)6 B, w9 P3 `1 n+ D* w; }, O- h
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    / Q7 s% u* N! b, Y8 U- gscio-tensorflow_2.13(com.spotify)https://github.com/spotify/scio0.9.6 等(共 97 个)( ]! _# ?; r8 D! E4 ^
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    ) d$ @1 R: j# X3 R4 r/ U: jxtdb-test(com.xtdb)https://github.com/xtdb/xtdb1.20.0 等(共 9 个)& `: G( d7 v# R0 x
    transport-netty4(com.strapdata.elasticsearch.plugin)https://github.com/strapdata/elassandra6.2.3.31 等(共 14 个)
    3 Q  A$ `4 N1 `+ osbt-metals(org.scalameta)https://github.com/scalameta/metals0.9.9 等(共 17 个)
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    genie-agent(com.netflix.genie)https://github.com/Netflix/genie4.0.4 等(共 100 个)
    . g9 u4 m# L3 i$ Dspring-kafka(org.springframework.kafka)https://github.com/spring-projects/spring-kafka2.7.9 等(共 79 个)
    + s, R& G0 [& i# V: _db-async-common_2.13(com.dripower)https://github.com/mauricio/postgresql-async0.3.109 等(共 19 个)- o& I; |) {6 q: }
    selenide(com.codeborne)https://github.com/selenide/selenide5.25.0-selenium-4.0.0-rc-2 等(共 18 个)  k& \. f1 D& x% w# Y0 D
    cloudfoundry-identity-server(org.cloudfoundry.identity)https://github.com/cloudfoundry/uaa4.30.0 等(共 1 个)7 t, J( I% _/ O5 {
    servo-atlas(com.netflix.servo)https://github.com/Netflix/servo0.13.2 等(共 20 个)
    7 l! t/ O: T3 grxnetty-spectator-tcp(io.reactivex)https://github.com/ReactiveX/RxNetty0.5.3-rc.4 等(共 12 个)
    : @$ L/ N% p4 N% y- omleap-tensorflow_2.10(ml.combust.mleap)https://github.com/combust/mleap0.9.6 等(共 25 个)
    4 ?& V2 u  T& wspark-testing-base_2.12(com.holdenkarau)https://github.com/holdenk/spark-testing-base2.4.4_1.1.1 等(共 100 个)
    + z# M% J( B9 l: E* N, z4 tgraphql-kotlin-spring-client(com.expediagroup)https://github.com/ExpediaGroup/graphql-kotlin5.0.0-alpha.0 等(共 20 个)6 H( m$ w1 f& x( q. F
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    twitter-server-logback-classic_2.13(com.twitter)https://github.com/twitter/twitter-server21.9.0 等(共 54 个)
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    9 T. P' i+ {: @8 m9 jakka-stream-alpakka-geode_2.12(com.lightbend.akka)https://github.com/akka/alpakka1.0-M1 等(共 13 个)6 V- z3 i4 G4 ?$ K2 A
    mantis-client(io.mantisrx)https://github.com/Netflix/mantis1.3.9 等(共 83 个)
    & P0 g5 I& m( f5 P8 u; w9 k: dmybatis-generator-plugin(com.itfsw)https://github.com/itfsw/mybatis-generator-plugin1.2.9 等(共 31 个)6 E- z( `* p4 E7 A: x% l
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    5 c7 {- s$ B3 j: \9 h* j& @azure-messaging-servicebus(com.azure)https://github.com/Azure/azure-sdk-for-java7.5.1 等(共 100 个)
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    0 t# d6 J: Y! t& X* H4 E) ]' bmicro-boot(com.oath.microservices)https://github.com/aol/micro-server1.2.6 等(共 38 个)
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    2 p7 `( B. P. s9 }kafka-connect-elastic5(com.datamountaineer)https://github.com/lensesio/stream-reactor1.2.0 等(共 5 个)
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    更多受影响组件查询,请点击以下链接查询:https://log4j2.huoxian.cn/

    漏洞排查

    代码排查:查看 pom.xml 是否引入 org.apache.logging.log4j、org.apache.logging.log4j2

    Linux:

    sudo find / -name "*log4j-*.jar"

    Windows:

    *log4j*.jar

    攻击排查

    日志排查:

    攻击者在利用前通常采用dnslog方式进行扫描、探测,对于常见利用方式可通过应用系统报错日志中的

    "javax.naming.CommunicationException"

    "javax.naming.NamingException: problem generating object using object factory"

    "Error looking up JNDI resource"关键字进行排查。

    流量排查:

    攻击者的数据包中可能存在:“${jndi:rmi”、“${jndi:ldap”字样,可根据此类关键字进行排查。

    漏洞复现

    Vulfocus 靶场环境

    目前 Vulfocus 已经集成 Log4j2 环境,可通过以下链接启动环境测试:

    http://vulfocus.fofa.so/#/dashboard?image_id=3b8f15eb-7bd9-49b2-a69e-541f89c4216c

    也可通过 docker pull vulfocus/log4j2-rce-2021-12-09:latest 拉取本地环境运行,本地启动命令:docker run -d -P vulfocus/log4j2-rce-2021-12-09:latest

    修复建议

    1、禁止使用 log4j 服务器外连,升级 idk 11.0.1 8u191 7u201 6u211 或更高版本。

    2、升级至 log4j-2.15.0-rc2:

         下载地址:https://github.com/apache/logging-log4j2/releases/tag/log4j-2.15.0-rc2

    3、紧急缓解措施:

    (1) 修改 jvm 参数 -Dlog4j2.formatMsgNoLookups=true

    (2) 修改配置 log4j2.formatMsgNoLookups=True

    (3) 将系统环境变量 FORMAT_MESSAGES_PATTERN_DISABLE_LOOKUPS 设置 为 true

    参考

    [1] https://github.com/apache/logging-log4j2/releases/tag/log4j-2.15.0-rc1

    [2] [LOG4J2-3201] Limit the protocols jNDI can use and restrict LDAP. - ASF JIRA (apache.org)

    [3] ASF Git Repos - logging-log4j2.git/blob - log4j-core/src/test/java/org/apache/logging/log4j/core/lookup/JndiRestrictedLookupTest.java

    [4] https://mp.weixin.qq.com/s/wC7mrK1Y4DYz9_yW4fLzbw

    [5] https://help.aliyun.com/noticelist/articleid/1060971232.html

    [6] https://mp.weixin.qq.com/s/C4zeXHKHDqPeRuLytO7Fzw

    $ g; H; Y' e" Q

    via https://nosec.org/home/detail/4917.html

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