CVE-2010-4344
Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session…
Critical
Known exploited
- Severity
- 9.8 / 10
- Critical · CVSS 3.1
- Exploit chance (EPSS)
- 71.71%
- Chance of exploitation in the next 30 days. Higher than 99.42% of scored vulnerabilities.
- Known exploited
- Yes
- In CISA's catalog since Mar 25, 2022
- Weakness
- —
- Not classified
- Fix
- None yet
- No fixed version published
Exploited in the wild. Exim Heap-Based Buffer Overflow Vulnerability (Exim Exim). Required action: Apply updates per vendor instructions. Due for U.S. federal agencies by Apr 15, 2022.
Description
Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.
How to fix
No fixed version has been published yet. Until one is, remove or replace the package, or turn off or isolate the affected feature. This page updates when a fix ships.
Severity breakdown
CVSS 3.1 9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
References
Advisories
- lists.opensuse.org/opensuse-security-announce/2010-12/msg00003.html
- openwall.com/lists/oss-security/2010/12/10/1
- secunia.com/advisories/40019
- secunia.com/advisories/42576
- secunia.com/advisories/42586
- secunia.com/advisories/42587
- secunia.com/advisories/42589
- debian.org/security/2010/dsa-2131
- kb.cert.org/vuls/id/682457
- metasploit.com/modules/exploit/unix/smtp/exim4_string_format
- securityfocus.com/archive/1/515172/100/0/threaded
- securityfocus.com/bid/45308
- securitytracker.com/id
- ubuntu.com/usn/USN-1032-1
- vupen.com/english/advisories/2010/3171
- vupen.com/english/advisories/2010/3172
- vupen.com/english/advisories/2010/3181
- vupen.com/english/advisories/2010/3186
- vupen.com/english/advisories/2010/3204
- vupen.com/english/advisories/2010/3246
- vupen.com/english/advisories/2010/3317
Fixes and patches
Exploits and evidence
Write-ups
Other links
Timeline
- Published
- Added to CISA's Known Exploited Vulnerabilities catalog
- Remediation due for U.S. federal agencies
- Last updated by the source
- Latest EPSS score
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