gsd-2021-44538
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver's session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-44538",
"description": "The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver\u0027s session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.",
"id": "GSD-2021-44538",
"references": [
"https://www.suse.com/security/cve/CVE-2021-44538.html",
"https://www.debian.org/security/2022/dsa-5034",
"https://ubuntu.com/security/CVE-2021-44538",
"https://advisories.mageia.org/CVE-2021-44538.html",
"https://security.archlinux.org/CVE-2021-44538"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
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"details": "The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver\u0027s session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.",
"id": "GSD-2021-44538",
"modified": "2023-12-13T01:23:20.860910Z",
"schema_version": "1.4.0"
}
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"refsource": "MISC",
"url": "https://gitlab.matrix.org/matrix-org/olm/-/tags"
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{
"affected_range": "\u003e=2.4.2 \u003c15.2.1",
"affected_versions": "All versions starting from 2.4.2 before 15.2.1",
"cvss_v2": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
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"cwe_ids": [
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"CWE-119",
"CWE-937"
],
"date": "2023-08-08",
"description": "The olm_session_describe function in Matrix libolm is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver\u0027s session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.",
"fixed_versions": [
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"identifier": "CVE-2021-44538",
"identifiers": [
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"not_impacted": "All versions before 2.4.2, all versions starting from 15.2.1",
"package_slug": "npm/matrix-js-sdk",
"pubdate": "2021-12-14",
"solution": "Upgrade to version 15.2.1 or above.",
"title": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2021-44538",
"https://matrix.org/blog/2021/12/13/disclosure-buffer-overflow-in-libolm-and-matrix-js-sdk",
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"severity": "HIGH",
"userInteractionRequired": false
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"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"impactScore": 5.9
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"lastModifiedDate": "2022-04-12T18:15Z",
"publishedDate": "2021-12-14T14:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- 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.