Apple iOS FaceTime 安全漏洞

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漏洞ID 1376963 漏洞类型 缓冲区错误
发布时间 2018-11-06 更新时间 2019-04-10
CVE编号 CVE-2018-4367 CNNVD-ID CNNVD-201810-1478
漏洞平台 macOS CVSS评分 N/A
|漏洞来源
https://www.exploit-db.com/exploits/45787
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-201810-1478
|漏洞详情
Apple iOS是美国苹果(Apple)公司的一套为移动设备所开发的操作系统。FaceTime是其中的一套视频通话软件。 Apple iOS 12.1之前版本中的FaceTime组件存在缓冲区错误漏洞。远程攻击者可利用该漏洞执行任意代码(内存损坏)。
|漏洞EXP
There are a variety of problems that occur when processing malformed H264 streams in readSPSandGetDecoderParams, leading to OOB read, OOB write and stack_chk crashes. I think the root cause is stack corruption. This issue can occur if someone accepts a malicious FaceTime call.

To reproduce the issue:

On the target device:

1) build no-encrypt.c (gcc -dynamiclib -o mylib)
2) copy the file to /usr/lib/mylib
3) Use insert_dylib (https://github.com/Tyilo/insert_dylib) to add /usr/lib/mylib to AVConference (insert_dylib --strip-codesig /usr/lib/mylib AVConference)

This will strip encryption to allow the target to receive unencrypted packets. It is also possible to repro this issue using the method described in  issue 1634 , but it is much more reliable and debuggable with the unencrypted packets

On the host device:

    1) Build video-replay.c attached (gcc -g -dynamiclib -o mylib video-replay.c) and copy to /usr/lib/mylib
    2) Use bspatch to apply the attached binpatch to /System/Library/PrivateFrameworks/AVConference.framework/Versions/Current/AVConference. The version I patched has an md5 sum of 0de78198e29ae43e686f59d550150d1b and the patched version has an md5 sum of af5bb770f08e315bf471a0fadcf96cf8. This patch alters SendRTP to retrieve the length of an encrypted packet from offset 0x650 of the encrypted buffer, as the existing code doesn't respect the output size returned from CCCryptorUpdate
    3) Use insert_dylib (https://github.com/Tyilo/insert_dylib) to add /usr/lib/mylib to AVConference (insert_dylib --strip-codesig /usr/lib/mylib AVConference)
    4) Edit /System/Library/Sandbox/Profiles/com.apple.avconferenced.sb to add /out as allow file read and write
    5) Restart the machine
    6) Extract the attached sc.zip to /out and change the permissions so it's readable by AVConference
    7) Call target, when they pick up, AVConference will crash

When I reproduced this, my host was a Mac mini running version 10.13.6. My target was a MacBook Pro running 10.13.6. This PoC only works on a Mac, but the vulnerable code appears to be in iOS 11.3.1 as well.


Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/45787.zip
|参考资料

来源:securitytracker.com

链接:https://securitytracker.com/id/1042003