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CVE-2011-2536

UnknownEPSS 1.94%

Last modified

CVE-2011-2536 is a vulnerability of currently unknown severity. chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.. EPSS estimates a 1.94% chance of exploitation in the next 30 days.

Description

chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.

Metrics

EPSS Probability
1.94%

77.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
DigiumAsterisk1.8.0—
DigiumAsterisk1.8.1—
DigiumAsterisk1.8.1.1—
DigiumAsterisk1.8.1.2—
DigiumAsterisk1.8.2—
DigiumAsterisk1.8.2.1—
DigiumAsterisk1.8.2.2—
DigiumAsterisk1.8.2.3—
DigiumAsterisk1.8.2.4—
DigiumAsterisk1.8.3—
DigiumAsterisk1.8.3.1—
DigiumAsterisk1.8.3.2—
DigiumAsterisk1.8.3.3—
DigiumAsterisk1.8.4—
DigiumAsterisk1.8.4.1—
DigiumAsterisk1.8.4.2—
DigiumAsterisk1.8.4.3—
DigiumAsterisk1.6.2.0—
DigiumAsterisk1.6.2.1—
DigiumAsterisk1.6.2.2—
DigiumAsterisk1.6.2.3Rc2
DigiumAsterisk1.6.2.4—
DigiumAsterisk1.6.2.5—
DigiumAsterisk1.6.2.6—
DigiumAsterisk1.6.2.15Rc1
DigiumAsterisk1.6.2.16—
DigiumAsterisk1.6.2.16.1—
DigiumAsterisk1.6.2.16.2—
DigiumAsterisk1.6.2.17—
DigiumAsterisk1.6.2.17.1—
DigiumAsterisk1.6.2.17.2—
DigiumAsterisk1.6.2.17.3—
DigiumAsterisk1.6.2.18—
DigiumAsterisk1.6.2.18.1—
DigiumAsterisk1.4.0—
DigiumAsterisk1.4.1—
DigiumAsterisk1.4.2—
DigiumAsterisk1.4.3—
DigiumAsterisk1.4.4—
DigiumAsterisk1.4.5—
DigiumAsterisk1.4.6—
DigiumAsterisk1.4.7—
DigiumAsterisk1.4.7.1—
DigiumAsterisk1.4.8—
DigiumAsterisk1.4.9—
DigiumAsterisk1.4.10—
DigiumAsterisk1.4.10.1—
DigiumAsterisk1.4.11—
DigiumAsterisk1.4.12—
DigiumAsterisk1.4.12.1—

Showing 50 of 112 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2011-2536?
chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.
How severe is CVE-2011-2536?
Severity scoring for CVE-2011-2536 is pending analysis. The EPSS model estimates a 1.94% probability of exploitation in the next 30 days.
How do I fix CVE-2011-2536?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST