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CVE-2017-15710

UnknownEPSS 18.20%

Last modified

CVE-2017-15710 is a vulnerability of currently unknown severity. In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). EPSS estimates a 18.20% chance of exploitation in the next 30 days.

Description

In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.

Metrics

EPSS Probability
18.20%

96.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
ApacheHttp Server2.4.1
ApacheHttp Server2.4.2
ApacheHttp Server2.4.3
ApacheHttp Server2.4.4
ApacheHttp Server2.4.6
ApacheHttp Server2.4.7
ApacheHttp Server2.4.9
ApacheHttp Server2.4.10
ApacheHttp Server2.4.12
ApacheHttp Server2.4.16
ApacheHttp Server2.4.17
ApacheHttp Server2.4.18
ApacheHttp Server2.4.20
ApacheHttp Server2.4.23
ApacheHttp Server2.4.25
ApacheHttp Server2.4.26
ApacheHttp Server2.4.27
ApacheHttp Server2.4.28
ApacheHttp Server2.4.29
DebianDebian Linux7.0
DebianDebian Linux8.0
DebianDebian Linux9.0
CanonicalUbuntu Linux12.04
CanonicalUbuntu Linux14.04
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux17.10
CanonicalUbuntu Linux18.04
NetappSantricity Cloud ConnectorAll versions
NetappStorage Automation StoreAll versions
NetappStoragegridAll versions
NetappClustered Data OntapAll versions
RedhatEnterprise Linux6.0
RedhatEnterprise Linux7.0
RedhatEnterprise Linux7.4
RedhatEnterprise Linux7.5
RedhatEnterprise Linux7.6

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2017-15710?
In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.
How severe is CVE-2017-15710?
Severity scoring for CVE-2017-15710 is pending analysis. The EPSS model estimates a 18.20% probability of exploitation in the next 30 days.
How do I fix CVE-2017-15710?
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.

Are you affected by CVE-2017-15710?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST