F5-K000140975: Race Condition
First published: Fri Sep 06 2024(Updated: )
A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| F5 BIG-IP Next | >=1.7.0<=1.9.2 | |
| F5 BIG-IP Next | >=1.1.0<=1.3.1 |
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Reference Links
Frequently Asked Questions
What is the severity of F5-K000140975?
The severity of F5-K000140975 is classified as high, due to the race condition vulnerability affecting OpenSSH's signal handling.
How do I fix F5-K000140975?
To fix F5-K000140975, upgrade your BIG-IP Next SPK or BIG-IP Next CNF to the versions that are not affected by this race condition.
Which software is affected by F5-K000140975?
F5-K000140975 affects F5 BIG-IP Next SPK versions from 1.7.0 to 1.9.2 and F5 BIG-IP Next CNF versions from 1.1.0 to 1.3.1.
Can F5-K000140975 be exploited remotely?
Yes, F5-K000140975 can be exploited remotely by an attacker who can interact with the OpenSSH server.
What type of vulnerability is F5-K000140975?
F5-K000140975 is a race condition vulnerability related to the handling of signals in OpenSSH's server.
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