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    CVE-2011-0017

    The open_log function in log.c in Exim 4.72 and earlier does not check the return value from (1) setuid or (2) setgid system calls, which allows local users to append log data to arbitrary files via a symlink attack.

    Published:Jan 25, 2011
    Last Modified:Apr 11, 2025
    EPS:Feb 2, 2011
    EPSS Score:0.00137
    CVSS Score:6.9

    Affected Products

    Vendor
    Exim
    Product
    Exim

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-132 Symlink Attack
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-17 Using Malicious Files
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-35 Leverage Executable Code in Non-Executable Files
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-66141 (CVSS 7.4) — Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandl…
    CVE-2026-66140 (CVSS 8.4) — Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain…
    CVE-2026-48840 (CVSS 5.3) — Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosur…
    CVE-2026-45185 (CVSS 9.8) — Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body…
    CVE-2026-40686 (CVSS 3.7) — In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing…
    CVE-2026-40684 (CVSS 5.9) — In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance w…
    CVE-2026-40687 (CVSS 4.8) — In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can …
    CVE-2026-40685 (CVSS 6.5) — In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator…
    CVE-2025-67896 (CVSS 7) — Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer over…
    CVE-2025-53881 (CVSS 6.9) — A UNIX Symbolic Link (Symlink) Following vulnerability in logrotate config in the exim package allowed privile…

    References

    ftp://ftp.exim.org/pub/exim/ChangeLogs/ChangeLog-4.74
    http://lists.exim.org/lurker/message/20110126.034702.4d69c278.en.html
    http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00004.html
    http://osvdb.org/70696
    http://secunia.com/advisories/43101
    http://secunia.com/advisories/43128
    http://secunia.com/advisories/43243
    http://www.debian.org/security/2011/dsa-2154
    http://www.securityfocus.com/bid/46065
    http://www.ubuntu.com/usn/USN-1060-1
    http://www.vupen.com/english/advisories/2011/0224
    http://www.vupen.com/english/advisories/2011/0245
    http://www.vupen.com/english/advisories/2011/0364
    http://www.vupen.com/english/advisories/2011/0464
    https://exchange.xforce.ibmcloud.com/vulnerabilities/65028
    ftp://ftp.exim.org/pub/exim/ChangeLogs/ChangeLog-4.74
    http://lists.exim.org/lurker/message/20110126.034702.4d69c278.en.html
    http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00004.html
    http://osvdb.org/70696
    http://secunia.com/advisories/43101
    http://secunia.com/advisories/43128
    http://secunia.com/advisories/43243
    http://www.debian.org/security/2011/dsa-2154
    http://www.securityfocus.com/bid/46065
    http://www.ubuntu.com/usn/USN-1060-1
    http://www.vupen.com/english/advisories/2011/0224
    http://www.vupen.com/english/advisories/2011/0245
    http://www.vupen.com/english/advisories/2011/0364
    http://www.vupen.com/english/advisories/2011/0464
    https://exchange.xforce.ibmcloud.com/vulnerabilities/65028

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High