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'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.
How to fix
- matrix element1.9.7 or later
- matrix javascript_sdk15.2.1 or later
- matrix olm3.2.8 or later
- schildi schildichat1.9.7-sc1 or later
- cinny_project cinny1.6.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| matrix element | v < 1.9.7 | 1.9.7 |
| matrix javascript_sdk | 2.4.2 ≤ v < 15.2.1 | 15.2.1 |
| matrix olm | 3.1.4 ≤ v < 3.2.8 | 3.2.8 |
| schildi schildichat | v < 1.9.7-sc1 | 1.9.7-sc1 |
| cinny_project cinny | v < 1.6.0 | 1.6.0 |
| debian debian_linux | 9.0, 10.0, 11.0 | — |
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Attack Surface Management
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