CVE-2018-25032
📋 TL;DR
This vulnerability in zlib allows memory corruption during compression (deflating) when processing input with many distant matches. It affects any software using vulnerable zlib versions for compression operations. Attackers could potentially execute arbitrary code or cause denial of service.
💻 Affected Systems
- zlib
- Any software using zlib for compression
📦 What is this software?
E Series Santricity Os Controller by Netapp
Fedora by Fedoraproject
Fedora by Fedoraproject
Fedora by Fedoraproject
Macos by Apple
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Mariadb by Mariadb
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Mariadb by Mariadb
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Nokogiri by Nokogiri
Ontap Select Deploy Administration Utility by Netapp
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Python by Python
Python is a high-level, interpreted programming language known for its readability and versatility. It is widely used in web development, data science, automation, and scientific computing.
Learn more about Python →Python by Python
Python is a high-level, interpreted programming language known for its readability and versatility. It is widely used in web development, data science, automation, and scientific computing.
Learn more about Python →Python by Python
Python is a high-level, interpreted programming language known for its readability and versatility. It is widely used in web development, data science, automation, and scientific computing.
Learn more about Python →Python by Python
Python is a high-level, interpreted programming language known for its readability and versatility. It is widely used in web development, data science, automation, and scientific computing.
Learn more about Python →Zlib by Zlib
Zulu by Azul
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⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise
Likely Case
Denial of service through application crashes or memory corruption
If Mitigated
Limited impact with proper memory protections and exploit mitigations
🎯 Exploit Status
Exploitation requires crafting specific input patterns to trigger memory corruption
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: zlib 1.2.12 and later
Vendor Advisory: https://github.com/madler/zlib/commit/5c44459c3b28a9bd3283aaceab7c615f8020c531
Restart Required: Yes
Instructions:
1. Download zlib 1.2.12 or later from https://zlib.net/ 2. Compile and install the updated version 3. Recompile any applications using zlib with the updated library 4. Restart affected services
🔧 Temporary Workarounds
Disable compression where possible
allAvoid using zlib compression for untrusted input
Input validation and sanitization
allImplement strict input validation for compression operations
🧯 If You Can't Patch
- Implement strict input validation for all compression operations
- Use application-level sandboxing or containerization to limit impact
🔍 How to Verify
Check if Vulnerable:
Check zlib version with 'zlib-flate -version' or examine library filesCheck Version:
zlib-flate -version 2>/dev/null || strings /usr/lib/libz.so* | grep -i versionVerify Fix Applied:
Verify installed zlib version is 1.2.12 or higher📡 Detection & Monitoring
Log Indicators:
- Application crashes during compression operations
- Memory corruption errors in system logs
Network Indicators:
- Unusual compression-related traffic patterns
SIEM Query:
source="*" ("zlib" OR "deflate" OR "compression") AND ("crash" OR "segfault" OR "memory corruption")🔗 References
- http://seclists.org/fulldisclosure/2022/May/33
- http://seclists.org/fulldisclosure/2022/May/35
- http://seclists.org/fulldisclosure/2022/May/38
- http://www.openwall.com/lists/oss-security/2022/03/25/2
- http://www.openwall.com/lists/oss-security/2022/03/26/1
- https://cert-portal.siemens.com/productcert/pdf/ssa-333517.pdf
- https://github.com/madler/zlib/commit/5c44459c3b28a9bd3283aaceab7c615f8020c531
- https://github.com/madler/zlib/compare/v1.2.11...v1.2.12
- https://github.com/madler/zlib/issues/605
- https://lists.debian.org/debian-lts-announce/2022/04/msg00000.html
- https://lists.debian.org/debian-lts-announce/2022/05/msg00008.html
- https://lists.debian.org/debian-lts-announce/2022/09/msg00023.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DCZFIJBJTZ7CL5QXBFKTQ22Q26VINRUF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DF62MVMH3QUGMBDCB3DY2ERQ6EBHTADB/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JZZPTWRYQULAOL3AW7RZJNVZ2UONXCV4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NS2D2GFPFGOJUL4WQ3DUAY7HF4VWQ77F/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VOKNP2L734AEL47NRYGVZIKEFOUBQY5Y/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOKFMSNQ5D5WGMALBNBXU3GE442V74WU/
- https://security.gentoo.org/glsa/202210-42
- https://security.netapp.com/advisory/ntap-20220526-0009/
- https://security.netapp.com/advisory/ntap-20220729-0004/
- https://support.apple.com/kb/HT213255
- https://support.apple.com/kb/HT213256
- https://support.apple.com/kb/HT213257
- https://www.debian.org/security/2022/dsa-5111
- https://www.openwall.com/lists/oss-security/2022/03/24/1
- https://www.openwall.com/lists/oss-security/2022/03/28/1
- https://www.openwall.com/lists/oss-security/2022/03/28/3
- https://www.oracle.com/security-alerts/cpujul2022.html
- http://seclists.org/fulldisclosure/2022/May/33
- http://seclists.org/fulldisclosure/2022/May/35
- http://seclists.org/fulldisclosure/2022/May/38
- http://www.openwall.com/lists/oss-security/2022/03/25/2
- http://www.openwall.com/lists/oss-security/2022/03/26/1
- https://cert-portal.siemens.com/productcert/pdf/ssa-333517.pdf
- https://github.com/madler/zlib/commit/5c44459c3b28a9bd3283aaceab7c615f8020c531
- https://github.com/madler/zlib/compare/v1.2.11...v1.2.12
- https://github.com/madler/zlib/issues/605
- https://lists.debian.org/debian-lts-announce/2022/04/msg00000.html
- https://lists.debian.org/debian-lts-announce/2022/05/msg00008.html
- https://lists.debian.org/debian-lts-announce/2022/09/msg00023.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DCZFIJBJTZ7CL5QXBFKTQ22Q26VINRUF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DF62MVMH3QUGMBDCB3DY2ERQ6EBHTADB/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JZZPTWRYQULAOL3AW7RZJNVZ2UONXCV4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NS2D2GFPFGOJUL4WQ3DUAY7HF4VWQ77F/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VOKNP2L734AEL47NRYGVZIKEFOUBQY5Y/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOKFMSNQ5D5WGMALBNBXU3GE442V74WU/
- https://security.gentoo.org/glsa/202210-42
- https://security.netapp.com/advisory/ntap-20220526-0009/
- https://security.netapp.com/advisory/ntap-20220729-0004/
- https://support.apple.com/kb/HT213255
- https://support.apple.com/kb/HT213256
- https://support.apple.com/kb/HT213257
- https://www.debian.org/security/2022/dsa-5111
- https://www.openwall.com/lists/oss-security/2022/03/24/1
- https://www.openwall.com/lists/oss-security/2022/03/28/1
- https://www.openwall.com/lists/oss-security/2022/03/28/3
- https://www.oracle.com/security-alerts/cpujul2022.html
