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CERTFR-2021-ALE-008
Vulnerability from certfr_alerte
Le 5 mai 2021, Qualys a publié un bulletin de sécurité contenant 21
vulnérabilités affectant le serveur mail Exim. Quatre de ces
vulnérabilités permettent une élévation de privilège et trois une
exécution de code arbitraire. Ces vulnérabilités affectent toutes les
versions de Exim antérieures à 4.94 et permettent in fine à un attaquant non
authentifié de prendre le contrôle du serveur mail avec les privilèges du compte
root.
Solution
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
NoneReferences
| Title | Publication Time | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Exim versions ant\u00e9rieures \u00e0 4.94",
"product": {
"name": "N/A",
"vendor": {
"name": "Exim",
"scada": false
}
}
}
],
"affected_systems_content": null,
"closed_at": "2021-06-10",
"content": "## Solution\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des\ncorrectifs (cf. section Documentation).\n",
"cves": [
{
"name": "CVE-2021-27216",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-27216"
},
{
"name": "CVE-2020-28013",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28013"
},
{
"name": "CVE-2020-28026",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28026"
},
{
"name": "CVE-2020-28009",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28009"
},
{
"name": "CVE-2020-28023",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28023"
},
{
"name": "CVE-2020-28011",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28011"
},
{
"name": "CVE-2020-28022",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28022"
},
{
"name": "CVE-2020-28008",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28008"
},
{
"name": "CVE-2020-28021",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28021"
},
{
"name": "CVE-2020-28024",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28024"
},
{
"name": "CVE-2020-28018",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28018"
},
{
"name": "CVE-2020-28010",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28010"
},
{
"name": "CVE-2020-28017",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28017"
},
{
"name": "CVE-2020-28012",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28012"
},
{
"name": "CVE-2020-28007",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28007"
},
{
"name": "CVE-2020-28020",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28020"
},
{
"name": "CVE-2020-28015",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28015"
},
{
"name": "CVE-2020-28016",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28016"
},
{
"name": "CVE-2020-28025",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28025"
},
{
"name": "CVE-2020-28014",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28014"
},
{
"name": "CVE-2020-28019",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-28019"
}
],
"initial_release_date": "2021-05-05T00:00:00",
"last_revision_date": "2021-06-10T00:00:00",
"links": [
{
"title": "BlogPost de Qualys concernant les vuln\u00e9rabilit\u00e9s",
"url": "https://blog.qualys.com/vulnerabilities-research/2021/05/04/21nails-multiple-vulnerabilities-in-exim-mail-server"
}
],
"reference": "CERTFR-2021-ALE-008",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2021-05-05T00:00:00.000000"
},
{
"description": "Cl\u00f4ture de l\u0027alerte. Cela ne signifie pas la fin d\u0027une menace. Seule l\u0027application de la mise \u00e0 jour permet de vous pr\u00e9munir contre l\u0027exploitation de la vuln\u00e9rabilit\u00e9 correspondante.",
"revision_date": "2021-06-10T00:00:00.000000"
}
],
"risks": [
{
"description": "Ex\u00e9cution de code arbitraire \u00e0 distance"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
}
],
"summary": "Le 5 mai 2021, Qualys a publi\u00e9 un bulletin de s\u00e9curit\u00e9 contenant 21\nvuln\u00e9rabilit\u00e9s affectant le serveur mail Exim. Quatre de ces\nvuln\u00e9rabilit\u00e9s permettent une \u00e9l\u00e9vation de privil\u00e8ge et trois une\nex\u00e9cution de code arbitraire. Ces vuln\u00e9rabilit\u00e9s affectent toutes les\nversions de Exim ant\u00e9rieures \u00e0 4.94 et permettent *in fine*\u003cspan\nclass=\"mx_MTextBody mx_EventTile_content\"\u003e\u003cspan\nclass=\"mx_EventTile_body markdown-body\" dir=\"auto\"\u003e \u00e0 un attaquant non\nauthentifi\u00e9 de prendre le contr\u00f4le du serveur mail \u003cspan\nclass=\"mx_EventTile_body\" dir=\"auto\"\u003eavec les privil\u00e8ges du compte\n*root*.\u003c/span\u003e \n\u003c/span\u003e\u003c/span\u003e\n",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Exim",
"vendor_advisories": [
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Exim du 5 mai 2021",
"url": null
}
]
}
CVE-2021-27216 (GCVE-0-2021-27216)
Vulnerability from cvelistv5
Published
2021-05-06 04:44
Modified
2024-08-03 20:40
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 has Execution with Unnecessary Privileges. By leveraging a delete_pid_file race condition, a local user can delete arbitrary files as root. This involves the -oP and -oPX options.
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28020 (GCVE-0-2020-28020)
Vulnerability from cvelistv5
Published
2021-05-06 04:10
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.92 allows Integer Overflow to Buffer Overflow, in which an unauthenticated remote attacker can execute arbitrary code by leveraging the mishandling of continuation lines during header-length restriction.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
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"url": "https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28020-HSIZE.txt"
},
{
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],
"url": "http://www.openwall.com/lists/oss-security/2021/07/25/1"
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CVE-2020-28018 (GCVE-0-2020-28018)
Vulnerability from cvelistv5
Published
2021-05-06 03:58
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL.
References
| URL | Tags | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
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CVE-2020-28013 (GCVE-0-2020-28013)
Vulnerability from cvelistv5
Published
2021-05-06 03:39
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles "-F '.('" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy.
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28015 (GCVE-0-2020-28015)
Vulnerability from cvelistv5
Published
2021-05-06 03:46
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters. Local users can alter the behavior of root processes because a recipient address can have a newline character.
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28026 (GCVE-0-2020-28026)
Vulnerability from cvelistv5
Published
2021-05-06 04:41
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters, relevant in non-default configurations that enable Delivery Status Notification (DSN). Certain uses of ORCPT= can place a newline into a spool header file, and indirectly allow unauthenticated remote attackers to execute arbitrary commands as root.
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28008 (GCVE-0-2020-28008)
Vulnerability from cvelistv5
Published
2021-05-06 03:07
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Execution with Unnecessary Privileges. Because Exim operates as root in the spool directory (owned by a non-root user), an attacker can write to a /var/spool/exim4/input spool header file, in which a crafted recipient address can indirectly lead to command execution.
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28021 (GCVE-0-2020-28021)
Vulnerability from cvelistv5
Published
2021-05-06 04:16
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into a spool file (which indirectly leads to remote code execution as root) via AUTH= in a MAIL FROM command.
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28007 (GCVE-0-2020-28007)
Vulnerability from cvelistv5
Published
2021-05-06 02:58
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Execution with Unnecessary Privileges. Because Exim operates as root in the log directory (owned by a non-root user), a symlink or hard link attack allows overwriting critical root-owned files anywhere on the filesystem.
References
| URL | Tags | |
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CVE-2020-28017 (GCVE-0-2020-28017)
Vulnerability from cvelistv5
Published
2021-05-06 03:55
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Integer Overflow to Buffer Overflow in receive_add_recipient via an e-mail message with fifty million recipients. NOTE: remote exploitation may be difficult because of resource consumption.
References
| URL | Tags | |
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CVE-2020-28016 (GCVE-0-2020-28016)
Vulnerability from cvelistv5
Published
2021-05-06 03:51
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows an off-by-two Out-of-bounds Write because "-F ''" is mishandled by parse_fix_phrase.
References
| URL | Tags | |
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CVE-2020-28009 (GCVE-0-2020-28009)
Vulnerability from cvelistv5
Published
2021-05-06 03:13
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Integer Overflow to Buffer Overflow because get_stdinput allows unbounded reads that are accompanied by unbounded increases in a certain size variable. NOTE: exploitation may be impractical because of the execution time needed to overflow (multiple days).
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28011 (GCVE-0-2020-28011)
Vulnerability from cvelistv5
Published
2021-05-06 03:22
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Heap-based Buffer Overflow in queue_run via two sender options: -R and -S. This may cause privilege escalation from exim to root.
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28014 (GCVE-0-2020-28014)
Vulnerability from cvelistv5
Published
2021-05-06 03:43
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Execution with Unnecessary Privileges. The -oP option is available to the exim user, and allows a denial of service because root-owned files can be overwritten.
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28012 (GCVE-0-2020-28012)
Vulnerability from cvelistv5
Published
2021-05-06 03:33
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Exposure of File Descriptor to Unintended Control Sphere because rda_interpret uses a privileged pipe that lacks a close-on-exec flag.
References
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CVE-2020-28025 (GCVE-0-2020-28025)
Vulnerability from cvelistv5
Published
2021-05-06 04:36
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Out-of-bounds Read because pdkim_finish_bodyhash does not validate the relationship between sig->bodyhash.len and b->bh.len; thus, a crafted DKIM-Signature header might lead to a leak of sensitive information from process memory.
References
| URL | Tags | |
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CVE-2020-28023 (GCVE-0-2020-28023)
Vulnerability from cvelistv5
Published
2021-05-06 04:24
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Out-of-bounds Read. smtp_setup_msg may disclose sensitive information from process memory to an unauthenticated SMTP client.
References
| URL | Tags | |
|---|---|---|
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CVE-2020-28024 (GCVE-0-2020-28024)
Vulnerability from cvelistv5
Published
2021-05-06 04:31
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp_ungetc was only intended to push back characters, but can actually push back non-character error codes such as EOF.
References
| URL | Tags | |
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CVE-2020-28022 (GCVE-0-2020-28022)
Vulnerability from cvelistv5
Published
2021-05-06 04:20
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 has Improper Restriction of Write Operations within the Bounds of a Memory Buffer. This occurs when processing name=value pairs within MAIL FROM and RCPT TO commands.
References
| URL | Tags | |
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CVE-2020-28010 (GCVE-0-2020-28010)
Vulnerability from cvelistv5
Published
2021-05-06 03:17
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 allows Out-of-bounds Write because the main function, while setuid root, copies the current working directory pathname into a buffer that is too small (on some common platforms).
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
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CVE-2020-28019 (GCVE-0-2020-28019)
Vulnerability from cvelistv5
Published
2021-05-06 04:03
Modified
2024-08-04 16:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
Exim 4 before 4.94.2 has Improper Initialization that can lead to recursion-based stack consumption or other consequences. This occurs because use of certain getc functions is mishandled when a client uses BDAT instead of DATA.
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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